Instruction: Carefully assess the user's review for any strong expressions of sentiment, either positive or negative. Based on your analysis, select the most fitting sentiment option from the provided list as output.

Input:
From the time I opened the box, the chemical/rubbery stench from the mat was unbearable. I left it to air overnight and the whole room smelled of it, and every time I touched it the smell got on my hands and clothes and made my eyes water.  So, I boxed it up and sent it back. I don't know if the smell ever would have subsided but didn't want to wait months/years to find out.

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