It would be A.
That hat looks quite good on you.
You would use well to describe an action.
Some examples;
She danced well in the competition.
You speak French very well.
The cake is good.
That sweater looks good on you.
I hope this helped!
Explanation:
the main idea is the key concept. the details help the main idea with who, what , where, when mayor or small. sorry that's all I can think of
Answer: Because
Explanation: Because is the only word that fits here and is gramatically correct in the first place, neverminding the fact that it says "Best Completes" <em>Because</em> is the only word that is gramatically correct in this situation.