Official explanation from veritas:
Explanation: In answer choice A, "twice," an adverb, is incorrectly used as the object of the preposition "by." Answer choice B introduces ambiguity by implying that the number of vehicles increased on more than two separate occasions, which does not make very much sense. Answer choice D uses the passive voice and suggests some unnamed agent (who did the doubling.) Answer choice E incorrectly uses the past perfect tense (had). "Had"
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Explanation: In answer choice A, "twice," an adverb, is incorrectly used as the object of the preposition "by." Answer choice B introduces ambiguity by implying that the number of vehicles increased on more than two separate occasions, which does not make very much sense. Answer choice D uses the passive voice and suggests some unnamed agent (who did the doubling.) Answer choice E incorrectly uses the past perfect tense (had). "Had"
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