Instruction: Given the user's review, identify the user's sentiment from the listed options. Answer using one of the options.

Input:
Such a waste of money. These take a full 30-60 (yes, 60) minutes to heat up. They are warm at best. NEVER at any point do they get hot. I've used these six times so far this winter and have been disappointed every time.

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