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 bought this backpack for my son and it is the perfect size! It is not so big that it looks bigger than him or to small that you cannot fit things in it. He can fit his snowpants in it and an extra pair of shoes. Its perfect for a small child just starting school!

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