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:
This is a great window fan.  Over the past 30 years I have purchased several. Lasko window fans are durable and very proficient in cooling every room in the house I've placed them. With their expanding sides they fit all windows perfectly. I recommend these fans to anyone wanting to keep their electric bills to a minimum

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