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:
I was looking for a set of headphones to use with my iPod while mowing the lawn. I had used a set of headphones that hook over the ears, but I had to turn the volume up too high to hear over the noise of the mower.
I looked around at a lot of sites (including high-end audiophile sites) and Koss was often suggested as a good company with good products. Their no-questions guarantee was often cited as one of the reasons Koss is a good company.
I decided to try the QZ-5 headphones because they are relatively inexpensive.
As soon as I tried them on, I was impressed. They blocked out a lot of sound without even having them attached to a sound source. I couldn't hear the TV or the phone ring with the headphones on.
When I tried them while mowing I knew I had a winner. I could leave the volume level at the same level I would use if I wasn't mowing the lawn. The noise of the mower was not eliminated, but it was reduced significantly. It became a low hum in the background instead of a roar that overwhelmed the music.
Comfort wise, they are good. I wear glasses and these work well with them. They don't pinch like the over-ear model did. It takes me about two hours to mow my lawn and they don't become uncomfortable during that time.
The sound is good enough that I plan on using the headphones to watch TV without the sound disturbing my wife.
Overall, I'm very pleased with the performance of these headphones.

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