Answer:
Option D :
is the correct answer.
Step-by-step explanation:
Given rational expression is:

In the first step of solving the rational expression, we will multiply the nominators and denominators.


Now we will solve the alike terms.

The product of rational expression is 
Hence,
Option D :
is the correct answer.
First, familiarize yourself with the math formula, use memorization techniques (ex.flashcards), understand the formulas, and get plenty of sleep.
6&7. Also -7,-6 is the correct answer