73.
Your Answer is
Correct Answer is C
Explanation
even guides the adverbial, the underlined part should be the subject of the sentence, here is the sentence pattern of there be, so item C is correct.
Item A: their is "their" and cannot be the subject, wrong.
Item B: Make the sentence have two predicates are/is, wrong.
Item D: There is no turning relationship before and after, wrong.