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GMAT Sentence Correction #286

If option D is incorrect because “which” refers to extinctions, why option E is correct and “that” refers to “an event”
Quite confused​:cry:

Sixty-five million years ago, according to some scientists, an asteroid bigger than Mount Everest slammed into North America, which, causing plant and animal extinctions, marks the end of the geologic era known as the Cretaceous Period.
A. which, causing plant and animal extinctions, marks
B. which caused the plant and animal extinctions marking
C. and causing plant and animal extinctions that mark
D. an event that caused plant and animal extinctions, and it marks
E. an event that caused the plant and animal extinctions that mark

In choice E, “that” does not refer to “an event” but to “extinctions”. Otherwise, it should be “marks”.
D is wrong because “which” can only refer to “extinctions” and thus “marks” is wrong.

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