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:
you need a punp too but this is great. i even used it to swim to the next island. needs to be topped off once every 2 days.

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