Would Switching the Special Case Order Affect the Return Value

Would switching the special case order affect the return value of the following method? public int mystery(int n, int m)
{
If (n == 0) // special case #1
{
Return 0;
}
If (n == 1) // special case #2
{
Return m;
}
Return m + mystery(n - 1, m) ;
}

A) No
B) Yes
C) It is impossible to tell.
D) An exception will be thrown.