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:
It was disappointing to find out that the battery on the flashing frisbee was dead.  I suspect the flashing light was activated before it was put in the packaging and ran out the battery. This was a secret santa gift so I only found out afterwards and could not ask for it back for an exchange.  In the future, I would appreciate it if the vendor checks this carefully before sending it out.

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