Answer:
The relationship between Einstein and Mileva was full of ups and downs. However, their intelligence, liberalism, and knowledge were the things that connected this couple.
They were always against the provincial people, and all of this connected them.
Explanation:
It is unclear what role Mileva Marić had in Einstein's work, but what is sure, is that she played an important one.
The proof of the importance of her role in his work is the agreement they had if the Einsteins win the Nobel. The agreement was that Einstein will take credits, but Mileva will take the money.
Was is a linking verb that is the past tense form of the linking verb is which refers to an event that already happened. If and as if can be related to something that has happen. Suppose has a similar definition with the two verbs. Hence the answer is D. all of the above