fA accepts one row of a 2D array, which is a 1D array, so the prototype is:
void fA (int arr);
fB accepts one element of a 2D array of integers, which is one integer, so the prototype is:
int fB (int number);
To pass one row of a 2D array, we need to give one index, which indicates the row:
To pass one element of a 2D array, we need to give 2 indices ([row][column]). Also, the function returns an int so we need to assign the return value to a variable that has been declared an int.
output = fB (array );