Which of the following is an example of the commutative property?
A (a + b) + c = (b + a) + c
B (a + b) + c = a + (b + c)
C a(b + c) = ab + ac
A (a + b) + c = (b + a) + c
B (a + b) + c = a + (b + c)
C a(b + c) = ab + ac