Use distributive property: a(b + c) = ab + ac
Steps to solve:
6(11 + 3)
~Use distributive property
(6 * 11) + (6 * 3)
~Simplify
66 + 18
~Add
84
Lets check each option to see which one equals 84.
Option A:
6 * 14
84
We don't need to check anymore options since Option A is correct.
Best of Luck!