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.
It comes from the Greek sophos. The list points up the fact that the SOPHlaughs at true wisdom at the very moment when he himself tries to appear wise. The poor SOPHomore is hard put to it pretending to be wise when he has only just come out of the freshman class. ... Full of wisdom; intellectual. 2.
What pattern. Theres no picture