Instruction: Determine the sentiment expressed by the user in her review from the provided choices, and respond by selecting one of the available options.

Input:
This is cute and my son was thrilled at first.  However, it was so hot inside that he really didn't spend a whole night in it.  We will try it in the winter, though!

Options:
A: very positive
B: positive
C: neutral
D: negative
E: very negative
Answer: C: neutral