Rewrite the sentence to make the pronoun reference clear.

she traced her ancestry back to the original president of the college, which her roommate thought was unfair.

the answer to your question would be that to make the pronoun reference clear another version of the sentence would be the following one: her roommate thought that it was unfair that her ancestors traced back to the original president of the college.

what the sentence really means is that her roommate considered unfair the fact that she was related to the first president of the college.

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.