Instruction: Carefully assess the user's review for any strong expressions of sentiment, either positive or negative. Based on your analysis, select the most fitting sentiment option from the provided list as output.

Input:
I purchased this to go on my sons helmet as it did not come with one.  This was half the cost of buying it in the sports store, and it works great! The strap is adjustable and clips on and stays on.

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