Which science fiction author wrote fahrenheit 451, a story about a world ruled by a totalitarian government in which reading and writing is completely banned?
a. isaac asimov
b. william j. levitt
c. ray bradbury
d. kurt vonnegut

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explanation:

the pronoun reference replaces a noun, but you have to make sure there's no room for confusion.

in the first sentence "her" could be referring to shely or to the sister. the answer there is "shelly called her sister and told her about the new baby."

in the second sentence "it" could be referring to the roof or the floor. the answer there is "since the roof leaks on the family room floor, we need to repair the roof."

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