Question

Displays of the aurora borealis, or "northern lights", can heat the atmosphere over the arctic enough __________________________________ 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 are affected and induces(D) that the trajectories of ballistic missiles are affected and induces(E) to affect the trajectories of ballistic missiles and induce

Answer 1

(A) to affect the trajectories of ballistic missiles, induced

Answer 2

A) To affect the trajectories of ballistic missiles, induce

Step-by-step explanation:

The key to selecting the correct option is taking in consideration the last word prior to the blank space, as well as the structure of the sentence that follows.

The preposition 'to' is right to follow the word enough, as it properly connects to the first clause and addresses a consequence of it. Moreover, a comma is used before induce since a list item - which is not the last one in the list - is being separated from the other items.

The preposition "that", although technically correct to follow enough, makes the subsequent clause unnecessarily long at the beggining and can create ambiguity issues.