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

Input:
I bought this set on sale a few years ago as a cheap set of backup knives.  They're long-since dull.

OK if you want a semi-decent set of disposable serrated knives.

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