I was baffled when I got an F on my test.
Es tos bien no dis les b c a dis
I believe there is more than one answer to this question.
B is the only answer that is an independent clause. A, C, and D are all dependent clauses, so presumably they are all answers.
They are dependent because they cannot stand alone as a sentence without an independent clause.
Hope that helped you.
B maybe??? Or A.. but I'm saying B