Question

Which clause is subordinate?

A.
What a funny cat he is!







B.
Whenever he wanders into the room.







C.
All day long, my cat does tricks.







D.
I can't help but laugh.

Answer 1

B is the answer to your question.

Answer 2

The answer is B, because it's part of a sentence, but is dependent on the main clause to work in a sentence( it doesn't work alone, but all the others do)