Jakob is asking to simplify the expression -3a + 4b + 5a + (-7b).

He writes: -3a + 4b + 5a + (7b) = -3a + 5a + 4b + (7b).

Which property allows him to do this?


A. the associative property


B. the commutative property


C. the distributive property


D. the additive identity property