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

Input:
Frankly, I haven't used them very much.  I bought them to replace some very bad headphones that came with my portable DVD player and they work very well for that purpose.

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