Read the sentence.
over the years, a number of fiction writers--as a premise for their novels--have adopted a useful theory about the earth's interior. this theory suggests it is hollow and potentially inhabitable.

which would be the best way to correct the pronoun reference problem in this sentence?

change "it" to "this interior"
eliminate "that"
change "earth's" to "its"
eliminate "it"

that's a lot of reading foo

explanation:

from the political point of view it could be said that the candidate   is an effective speaker because she takes a strong position on the issue. it is an open discussion but probably she is making a presentation and can choose which subjects she wants to address. she is very likely to attain her aim which is to convince voters to accept her proposal.

the answer is definitely option c. "sonnet xxxi best illustrates the division. in the octave, the poet observes that the moon is in love. in the sestet, he gives his reaction to the fickleness of woman's love."