Complete the Code for the Recursive Method PrintSum Shown in This

Complete the code for the recursive method printSum shown in this code snippet, which is intended to return the sum of digits from 1 to n:
Public static int printSum(int n)
{
If (n == 0)
{
Return 0;
}
Else
{
______________________________
}
}

A) return (printSum(n - 1) ) ;
B) return (n + printSum(n + 1) ) ;
C) return (n + printSum(n - 1) ) ;
D) return (n - printSum(n - 1) ) ;