Question

Which sentence uses apostrophes and end punctuation correctly?                                     
 A. Didn't you see the new robins nest in the tree!
B. Did'nt you see the new robins' nest in the tree.
C. Didn't you see the new robins' nest in the tree?
 D. Didnt you see the new robins' nest in the tree?

Answer 1

C is your answer.
Didn't is the compound word for Did and Not. 
The sentence is  question.
C is the only correct one with the apostrophe and such.

Answer 2

C is the correct answer