<u>Answer:</u>
1. The correct answer option is B.
2. The correct answer option is C.
4. The correct answer option is D.
<u>Step-by-step explanation:</u>
1.
÷ 
Changing division to multiplication by taking the reciprocal of the latter fraction:


Cancelling the like terms to get:

The correct answer option is B. 
2. 
Factorizing the terms and then cancelling the like terms to get:


The correct answer option is C.
.
4. 
Changing division to multiplication by taking the reciprocal of the latter fraction:


Cancelling the like terms to get:

The correct answer option is D.
.