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 use it almost every day to cook outside in the summer when the house is closed down and the AC is on so I don't have cooking odors lingering inside. Love it except for one thing. On the higher heat settings the flame isn't blue it's yellow so I think the burning isn't as efficient as it should be and it turns the bottoms of my pans black.

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