Identify the complete sentence.

ACarol seemed happy and excited today.
BLike the time i got into an argument with my boss.
CLooking over the fence.
DUp all night long sick with a cold

Verified Answer :

Your answer would be A. Carol seemed happy and excited today.

Acarol seemed happy and excited today
It's this one because the last two don't have subjects, and a sentence can't be a sentence without a subject.
B has a subject, but the reason it isn't the answer is because it is a dependent clause. this is an incomplete thought.