Answer: Eeyore is sad and doesn't know why.
Step-by-step explanation:
The statement that describes Eeyore's character based on the characterization in the excerpt is that Eeyore is sad and doesn't know why.
From the excerpt, the old grey donkey, Eeyore, was referred to as a mopey and a depressed loner. The donkey always had too many negative thoughts, and according to the excerpt, he wasn't even aware where the thoughts came from. This shows that he's sad and doesn't even know why he's sad.