hazelnut
Difficulty Level: 750-800
Tricky Question
The primary catalyst fueling the rapid spread of wind farms across the country – from offshore platforms along the coasts through the vast deserts and plains –
has been a combination of federal tax incentives and state mandates requiring utilities to raise renewable power to increasing percentages of their overall energy production.
A. has been a combination of federal tax incentives and state mandates requiring utilities to raise renewable power to increasing percentages of their
B. have been combinations of federal tax incentives and state mandates requiring utilities to raise renewable power to increasing percentages of their
C. has been a combination of federal tax incentives and state mandates that require utilities to raise renewable power to an increasing percentage of its
D. have been a combination of federal tax incentives and state mandates that require utilities to raise renewable power to increasing percentages of their
E. has been a combination of federal tax incentives and of state mandates requiring utilities to raise renewable power to increasing percentages of their
VERITAS PREP OFFICIAL SOLUTION:
As you first look at this problem, you should immediately identify two singular-vs.-plural Decision Points: the verb tense in "has" vs. "have" at the first word of the answer choices, and the fact that several choices end with either "its" or "their."
The first decision point, "has" vs. "have," requires you to find the subject of that initial verb. And while the problem throws several nouns at you via modifiers, the correct subject is "catalyst," which is singular. This means that "has" is required, helping you to eliminate B and D.
For the pronoun "its" vs. "their" at the end of the sentence, recognize that the antecedent is "utilities," since utilities are the only noun capable of having overall energy production. Because "utilities" is plural, you can eliminate "its" and answer choices C and E.
Therefore, choice A is correct.