Why does Juan fear for Mariana's safety even in
"that hidden Paris neighborhood"?

Incomplete question. However, I infer you are referring to the story "The Censors".

Likely because of his background.

Explanation:

More likely his background affected his concern for Mariana. Probably be had experienced government censorship of information where he lived, and so thought it was in such neighborhood that Mariana lived.

However, Mariana was in a hidden Paris neighbourhood likely different from Juan's own.

i don't see any right answer. i don't know english and only math

d. murder of a son and cooking the son for a feast

procne murdered her son and served him to tereus, her husband and her son's father. she did this out of revenge. tereus raped her sister, philomela, and cut her tongue out to keep her from talking. philomela managed to communicate it to procne and procne sought revenge.

tantalus murdered his son and fed him to the gods because he was angry with the gods. the gods punished him by putting him in a pool of water that evaporates when he tries to drink and having fruit hang just out of his reach.