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:
This is the best sharpening stone.  Our son bought this for his pocket knives and now is planning on getting one for our house for all of the kitchen knives and my husbands pocket knives.  To say he is satisfied with this purchase in an understatement.  It comes highly recommended.

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