Answer:
B. aging and sadness.
Step-by-step explanation:
In this excerpt of "Ode to a Nightingale," the speaker talks to the bird. He urges the bird to leave, and to go back to a place where he has never known aging and sadness. He states that to live among men is to live in constant suffering. Men get tired, old, sick. Men die. Beautiful people age and they grow pale and thin. The speaker implies that the human life is so terrible, the bird is lucky not to have known it.