Answer:
B
Step-by-step explanation:
start by multiplying the 6a to each number in the other set of parenthesis.
after doing so, you end up with the numbers: and
now multiply the one to each number in the other parenthesis. you get this:
and .
then set it all next to each other: +
then combine like terms (-54a and 2a) you get:
so that is how you get B for the answer