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:
It is hard to find wireless trackball, so when I found the Logitech Cordless Trackman Wheel, I was pleased to say the least. I wanted a trackball for my laptop computer which I use in my service vehicle. The Trackman has proven to be everything I wanted. It's ease of use in a mobile inviroment is just what I wanted.

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