Instruction: Determine the sentiment expressed by the user in her review from the provided choices, and respond by selecting one of the available options.

Input:
These books are getting hard to find in the stores so I am so happy I was able to purchase these online. They come with 10 pages and I fill each one with 4 refills. Works great!

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