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 purchased two Monster Cable MPS850 power centers for our electronics last year. Recently the service neutral power line was broken in a storm. The resulting power surge (208 volts to be precise) fried several of our electronic items connected to these power strips. We had other sensitive electronics (including a laptop and a pair of Samsung tablets) plugged into cheaper, competing brand surge protectors. Nothing else was damaged.

I wasn't too worried about this because of Monster's $150,000 protection guarantee. That was a mistake. After calling and speaking with a friendly customer service agent, Rodrigo Chavez, I was instructed to email a copy of the invoice where I purchased the power centers. That took a while due to various electronics being fried, but I did do so about a week later.  Mr. Arturo Castro responded quickly with this:

"Thank You for the receipt, unfortunately the store factory depot is not listed as an authorized dealer, we won't be able to proceed with your warranty claim.

 You case is canceled.

 We are sorry for the inconvenience."

Now, no where in the ad for this on Amazon.com did they mention that only certain dealers could be used for this warranty to be valid. These were purchased new. The last human being to touch them was someone who worked for Monster. Luckily for me, I live in a country where lies told by corporations are excused by lawyers who politely twist anything to the profit of their corporate masters.

But, they do feel really bad about it as they take my money and run. Their hearts are heavy with regret because they are "sorry for the inconvenience."

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