Mr. Molinari suspects that students do much better on some topics in math than in others. He wants to review students’ grades by topic to see if there are any trends. Which text feature will help him develop a visual image of this information?

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."

we need more information in order to answer.

for me this my answer o fortunately, they did not notice, and i could pretend not to care.​   i hope this you