Complete the Following Code Snippet, Which Is Intended to Be

Complete the following code snippet, which is intended to be a recursive method that will find the sum of all elements in an array of double values from index to the end of the array: // return the sum of all elements in arr[]
Public static double findSum(double arr[], int index)
{
If (index == 0)
{
_____________________
}
Else
{
Return (arr[index] + findSum(arr, index - 1) ) ;
}
}
Assume that this method would be called using an existing array named myArray as follows:
FindSum(myArray,myArray.length - 1) ;

A) return arr[index];
B) return arr[index + 1];
C) return arr[1];
D) return arr[index - 1];