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:
This pre-filter wraps around the HEPA filter and attaches using 2 Velcro strips...excellent design.  The air purifier will let you know when it's time to replace, so just keep an extra one on hand.  The supplier did an outstanding job resolving a delivery problem to my complete satisfaction.

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