Which word, if it replaced the word "activity" in the sentence above, would CHANGE the meaning of the sentence?

the sample answer on e2020

conflicting values are demonstrated between two different groups in animal farm. first, the farm animals value hard work. this is shown by them working late and working long hours at the request of the pigs. napoleon and the pigs, however, sleep late daily. furthermore, the animals value equality. this differs from the value of napoleon and the other pigs. instead of equality, they value only gaining power and maintaining their own privilege, which is demonstrated by their taking extra milk and sleeping in beds.

because she needs money

d. it compares the speaker reflection to a predatory bird that haunts the speaker