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  • GMAT Prep: SC question in 15 seconds

    Displays of the aurora borealis, or “northern lights,” can heat the atmosphere over the arctic enough to affect the trajectories of ballistic missiles, induce electric currents that can cause blackouts in some areas and corrosion in north-south pipelines.

    (A) to affect the trajectories of ballistic missiles, induce
    (B) that the trajectories of ballistic missiles are affected, induce
    (C) that it affects the trajectories of ballistic missiles, induces
    (D) that the trajectories of ballistic missiles are affected and induces
    (E) to affect the trajectories of ballistic missiles and induce

    I arrived at answer E in about 15 seconds, surprisingly. Here’s what went through my head:
    I saw the underlined comma in “missiles, induce” and the verb earlier on was “can affect the trajectory”
    Immediately, I considered in my head that the answer is one of those -ING options like this:

    Alternative #1:
    “Displays of the aurora borealis, or “northern lights,” can heat the atmosphere over the arctic enough to affect the trajectories of ballistic missiles, inducing electric currents that can cause blackouts in some areas and corrosion in north-south pipelines.”

    which can also be rewritten like this according to framework #3:

    ” Inducing electric currents that can cause blackouts in some areas and corrosion in north-south pipelines, displays of the aurora borealis, or “northern lights,” can heat the atmosphere over the arctic enough to affect the trajectories of ballistic missiles,.”

    But I did not see any -ING versions of INDUCING in the answer choices as I quickly skimmed down the right side of the anwer choices.

    Alternative #2:
    The next alternative I considered was using the “and” conjunction. The first verb as we noted before was “can heat.” So naturally that should be followed like this:
    “can affect X and induce Y”

    This second alternative is simple and clear–and it is answer choice (E).

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