How does sentence 6 need to be changed? (6) I admit that I had enjoyed sharing a room with my little brother for the last six years.
A. Change admit to admitt
B. Change that to it
C. Change had enjoyed to have enjoyed
D. Insert a comma after brother

The answer is C.

If you put a comma after brother it creates a comma splice sentence. The sentence is complete without the comma.

Had is referring to the past.
Have is referring to now.

It can’t be A because it’s spelled wrong.
It can’t be B because that simple doesn’t make sense in the sentence.
It can’t be D because you’d create a comma splice.

So, the answer is C

Cupidity because the principal wants to give out important yupcoming