Question

I am worried that they __________ the hidden prize before we are able to. A. have found B. will find C. find D. had found

Answer 1

B will find. is correct
see how the sentence says before we _are_ able to. they are using present tense and A,and B are using past tense while b is also present tense
if it were a or c it would be before we _were_ able to