Context: This bird was very brightly colored and strong . He flew about the room , whistling , singing all the while . The white bird seemed spiritless and withdrawn as the colorful , yellow bird flitted about , singing , landing atop the cage , then flying up a bit above it to perch .

Question: What 's a possible reason the bird flew about the room ?
Options:
0. Because it was singing all the while .
1. None of the above choices .
2. Because it was whistling .
3. Because it was very brightly colored .
Answer: 1