Instruction: Assess the user's sentiment in the provided review and select the appropriate sentiment option from the list as the answer.

Input:
Although the Rio Riot is quite a piece of equipment, I'm returning it today.
Pros: EXCELLENT sound, best I've ever heard. Great interface. Amazing capacity. Decent radio. Nice carrying case.
Cons: A bit big, but who cares? Very slow transfers (slower than normal USB transfers.) Songs aren't synced to desktop computer.
Deal-breaker: The battery. They recommend you drain it completely before fully charging, which sounds like old tech. Battery life can be 10 hours, but frequently, is far less, even after full drain/recharge. Sometimes, battery reads empty even when fully charged. Also, you can't change the battery or buy a spare... not good if you want to take it with you for more than 10 hours at a time!
Sorry, folks... I don't think this is ready for prime-time just yet.

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