Context: I had a bat once , except I thought he was a mouse , and I named him Fred . I was living in a converted attic outside of Cambridge , MA and my roof was slanted . Someone put a wall from the part of the roof that was too low to walk under to the ground , and some of that I used as closet space , and the rest was storage for the person who owned the house .

Question: What may be the reason why they thought the bat was a mouse ?
Options:
0. They only heard the animal move around and never saw it .
1. None of the above choices .
2. They never learned the difference between the two animals .
3. They were blind and could only hear the animal scream .
Answer: 0