Calling a function that contains an array

I'm being all spacey and tired right now on this homework assignment. The issue I'm having is that I cannot seem to call the function/method to the Main method so it can be executed. For some reason the array won't pass. I have to pass the arrays by reference (which I don't seem to be having any issues with) and the average score by value. Any assistance would be greatly appreciated.

Edit: So I appear to have fixed it..kinda. But I am having an issue with the last function; DisplayBelowAverage.

I am receiving 2 errors: Argument1: Cannot convert from 'refString[] to 'ref string' and The best overloaded method match for Lab5_exA.Program.DisplayBelowAverage(ref string, ref double[],ref double, ref int)' has some invalid arguments.

I cannot seem to find where the issue is occurring. It is referring to my array: playerName when I select the errors but I can't see an issue anywhere besides maybe the fact that "ref string" in the first error doesn't have the array symbols "[]" as the other array displays.

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace Lab5_exA
{
class Program
{

    public static double InputData(ref string[] playerName, ref double[] playerScore, ref int players, ref double totalScore)
    {
        do
        {
            Console.Write("Enter the player name or type 'Q' or 'q' to quit.."); //get player name
            playerName[players] = Console.ReadLine();

            if (playerName[players] == "Q" || playerName[players] == "q") //checks for exit value
            {
                break;
            }

            Console.WriteLine("Enter the player's score.."); //get player score
            playerScore[players] = Convert.ToDouble(Console.ReadLine());

            totalScore += playerScore[players];

            players++; //establish size of array

        } while (true);
        return 0;
    }

    public static double DisplayPlayerData(ref string[] playerName, ref double[] playerScore, ref int players)
    {
        for (int w = 0; w < players; w++)
        {
            Console.WriteLine("Player: " + playerName[w] + "\t" + "Score: " + playerScore[w]);
        }

        return 0;
    }

    public static double CalculateAverageScore(ref int players, ref double totalScore, ref double averageScore)
    {
        averageScore = totalScore / players;
        return averageScore;
    }

    public static double DisplayBelowAverage(ref string playerName, ref double[] playerScore, ref double averageScore, ref int players)
    {
        int z = 0;

        Console.WriteLine("Average Score: " + averageScore);
        Console.WriteLine("The following players received a score below the average score..");
        Console.WriteLine("Name \t Score");
        Console.WriteLine("---- \t ----");

        while (z < players)
        {
            int y = 0;

            if (playerScore[y] < averageScore)
            {
                Console.WriteLine(playerName[y] + "\t" + playerScore[y]);
            }
        }
        return 0;
    }

    static void Main(string[] args)
    {
        string[] playerName = new string [100];
        double[] playerScore = new double [100];
        int players = 0;
        double averageScore = 0;
        double totalScore = 0;

        InputData(ref playerName, ref playerScore, ref players, ref totalScore);
        DisplayPlayerData(ref playerName, ref playerScore, ref players);
        CalculateAverageScore(ref players, ref totalScore, ref averageScore);
        DisplayBelowAverage(ref playerName, ref playerScore, ref averageScore, ref players);

        Console.Read();

    }
}

}