What is the definition of an omniscient narrator
a. a narrator who tells the story from the perspective of a character who is not a part of the story.
b. a narrator who tells the story from the perspective of several characters within the story.
c. a narrator who knows every detail about every character and sequence of events
d. a narrator who knows the thoughts and feelings of one character from within the story

D

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."