Choose the best alternative for the underlined part 13.
A. NO CHANGE B. begins realizing it. C. began reality. D. began it’s realizing.
The best answer is A, because it proposes a clear and idiomatic phrasing and a consistency of verb tense in the sentence. The other choices have defects in clarity, logic, and sentence structure. Choice B makes the sentence unclear and creates a tense shiftfrom the past tense (turned) to the present tense (begins). Choice C results in a sentence that has no logical meaning. Choice D is unclear and illogical; also, it can be ruled out because it uses the contraction it's incorrectly.