Ms. Wright tries to get inside Iran to understand how it works, the role it has played in the Middle East, and its intricate relationship with the United States, which is complex and depends heavily on understanding of the Farsi language.
(A) which is complex and depends
(B) because it is complex and depends
(C) but they are complex and depend
(D) which are complex and depend
(E) a task that is complex and depends
My thought process:
Ms W tries to get inside Iran to understand 1.how it works 2.role it played 3. It's relationship with US ...but?because? it's complex - doesn't hold meaning as the sentence is trying to say what she does is complex. Does she do it because its complex?no. Eliminated B, C
Left with 'US, which is/are complex'. I'm still learning but what I've understood is which can't jump too far. Which shouldnt be refering to US as complex in that case so id say incorrect. Eliminated A, D
Read E, it fits the sentence.