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 had hoped to make smoothies with this mixer, but it has no power to process frozen fruit.  Even when I put the frozen fruit in my processor first, this still could not mix it with frozen yogurt.  I returned the mixer and continue using my blender.

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