In the fourth paragraph, the narrator presents himself as A
confronting a figure from the distant past
B
possessing a photographic memory
с
unable to admit that a friend has disappeared
D
perplexed by an event that occurred long ago
E
angered by the permanence of nature and the impermanence of humanity

d) perplexed by an event that occurred long ago

Explanation:

through negative experiences we learn many things its sort of like karma if u do something bad to someone and u get a consequence u dont like the next time u wont do it again and as for positive ur not really learning anything and another example for negativity people didnt want barrack obama as president because they thought he was the worst and he was taking but now we have donald trump   and hes   is not anyone and shut down the government over sum petty stuff unlike barrack obama who shut down the government because they did not want to give health care to the community and now these people who want him out want him in now

for this, you need to remember something significant in your own life, for example, if you were bullied when you were younger, you can mention your memories on this and touch on how such treatment can harm other kids your age either physically or mentally. (racism, car crashes, a parent in the hospital are all very good subjects, think hard on it! )

hope i ! : )