The old age of a person. This is pretty easy since it says the answer at the beginning of the poem;
"Old age is a flight of a small cheeping bird".
Answer:
C. I was so filled with incredulity when my brother told jokes that my jaw hit the ground!
I hope I helped! ^-^
C. Middle-class salesman buys his family a home after 20 years of hard work
Answer:
the man's life ends so suddenly.
Explanation: