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

Input:
I bought these headphones for projects in sound class. The stereo is nice and adds a little something to the mix that I'm working on. I'm giving four stars because while it does its job as professional headphones it doesn't stand out a lot.

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