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:
I work in the spray booth at a small custom cabinet shop. The set up we have doesn't have a good flow of air. I purchased this mask with high expectations! It didn't fail me.

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