Factor Check by Multiplying $28 \mathrm{a}+7 \mathrm{~b}$ A) $7(4 a+7 b)$ B) $7(4 a+b)$

Multiple Choice

Factor. Check by multiplying.
- $28 \mathrm{a}+7 \mathrm{~b}$

A) $7(4 a+7 b)$
B) $7(4 a+b)$
C) $28(a+b)$
D) $4(7 a+7 b)$