Instruction: Given the user's review, identify the user's sentiment from the listed options. Answer using one of the options.

Input:
We bought our Razor and it is just now warm enough for our son to use it and it will not work. We have charged it for days and gotten it well up to three MPH and it still will not work. We cannot call support because they are closed on Saturday's and our ability to return the product expired on 1/31. I am very sad for our son and upset that over $100 has been thrown away to something he looked very much forward to being able to use.

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