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:
BTW, they sell the filters at Amazon. I've had a new humidifier every year for the last five years. I bought this in October, and it will be the last humidifier I buy (until it wears out!). I have well water, and I've added Holmes three water conditioning products; the humidifier works wonderfully and it's easy to clean. I've replaced the filters once in two months, which is wonderful, as my water is almost brown!

I use a funnel to fill the bottles and they fit flat in the sink. I can't imagine a humidifier any easier to use. Oh, I did buy an inexpensive humidstat, and it helps me control the humidity. I live in a three room apartment, and, again, I can't say enough about this product. I will say that once you place it where you want it to be, you cannot move it until the bottles are out and you take the fan off--very simple to do!

I've had Vornado fans and other products, and they always seem to out perform the rest.

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