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:
The Bosu is sturdy and well constructed.  With the blue side up, it helps to build supporting muscles for the ankles and knees.  Flip it over and stand on the bottom, and it works the supporting muscles of hips and core.  I didn't have any particular problem with balance to begin with, but now my balance is better than ever; even my ice skating has improved!  What i like best is that it helps to warm up my knees, which are often stiff.

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