Asmart consumer of media
a.
is completely immune to media influences
c.
can distinguish facts from opinions
b.
ignores all media
d.
produces counter-media

i think the answer is d.

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."