There are elements of truth in each of the options, but C is the only correct answer.
While Ben Gunn hints to Jim that he has already found the treasure, claiming that he's rich, Jim doesn't catch on to this at the time. Because Jim left the stockade to recover and beach the Hispaniola, he wasn't present to learn Dr. Livesey negotiated with Ben Gunn to relocate the stockade group to Gunn's cave, where...
The sentence in which the pronoun and the antecedent are not in agreement is option C. If the bus is late, he will be late to class. In the first clause, the subject of the sentence is the word "bus", and in the next clause, the subject changed to "he" and the pronoun he does not clearly state its antecedent.
(2x-3)(x+7)=
2x^2 + 14x - 3x - 21=
2x^2+11x-21.
