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

Input:
I have has previous cd players (various brands) with programability, however that feature either never worked right or the operating insructions were impossible to figure out. This unit has excellant sound and antiskip but I gave up trying to figure out how to use the programming feature. An e-mail to the manufacturer for help was never responded to.

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