The predicate nominative in this sentence is state, because it is showing what Alaska became.
Answer: C
Explanation:
A: The boy wanted to get ice cream, and he did. He should be completely happy with that. No problem in sigh
B: Nothing is preventing Ryan from cooking
C: Julie wanted to, but she couldn't. That's a problem
D: Same as A. She wanted to go, so she did. Everyone's happy
I think the answer to the question is A