关于自定义函数数组调用的方法，要怎么改写

Question

class Program
{

    static void Main(string[] args)
    {
        int[] arr = new int[] { 10, 20, 30, 40, 50, 60 };
        int[] b = A(arr);
        for(int i = 0; i < b.Length; i++)
        {
        Console.WriteLine(b[i]);
        }

    }
    /*static int[] Add5(int[] arr)
    { return arr.Select(x => x + 5).ToArray(); }*/
     static int  A(int[] arr)
    {
        int i;
        int[] data = new int[arr.Length];
        for (i = 0; i <arr .Length; i++)
        {
            data [i] = arr[i] + 5;
        }
        return data [i];
    }
}

Answer 1

static int[] Add5(int[] arr) { return arr.Select(x => x + 5).ToArray(); }
static void Main(string[] args)
{
int[] arr = new int[] { 10, 20, 30, 40, 50, 60 };
int[] b = Add5(arr);
for(int i = 0; i < b.Length; i++)
{
Console.WriteLine(b[i]);
}