Complete the factored form of the linear expression.
15x + 10y = ( ) ( + )
A. 15x + 10y = (5) (2x + 3y)
B. 15x + 10y = (5y) (3x + 2)
C. 15x + 10y = (5x) (3 + 2y)
D. 15x + 10y = (5) (3x + 2y)