Instruction: Analyze the user's review text and determine the overall sentiment expressed, then choose the corresponding sentiment option from the provided list (A: very positive, B: positive, C: neutral, D: negative, E: very negative) based on the identified sentiment.

Input:
This little vac works very well but the battery will not charge after only 3 months.  Very disappointed, perhaps I can get a battery replacement for free.

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