624. Scientists have suggested that once every 10 million years or so a truly colossal object from space cuts through the atmosphere and slams into Earth, sending up a global pall of dust that blots out the Sun, alters the climate, and changes the course of evolution by killing off many plant and animal species.

(A) sending up a global pall of dust that blots
(B) thus sending up a global pall of dust to blot
(C) thereby sending up a global pall of dust to blot
(D) and that sends up a global pall of dust, blotting
(E) which sends up a global pall of dust, blots

Solution:

Parallelism + Modifiers

In B, C, and D, parallel structure- “blots…cuts…slams…” is not followed and hence, these choices are not parallel.
In E, “which” illogically suggests that “Earth” is “sending up a global pall…”.
A is parallel and hence, it is the best choice.

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