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:
Affordable and they work great. I use these or Crosman co2's,whichever are cheaper and these were and I don't notice a difference with my Crosman BB guns. Crosman c11 and c31.

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