Inverse beta decay, the subatomic interaction by which an electron and

Magoosh Official Explanation

A question about the role of inverse beta decay in a supernova.

Notice that this sentence begins with [noun] + [noun modifier]. The noun, “inverse beta decay,” is the subject and needs a verb. Choice (A) never provides a verb for this subject—the famous missing verb mistake!—so it is incorrect.

Choice (B) has parallelism issues inside the “that” clause. It has “push out . . . and transforming,” a full verb in parallel with a participle. That’s a parallelism mistake. This choice is incorrect.

Choice (C) inexplicably has the present progressive tense, “is pushing.” This tense is completely incompatible with the context. This choice is incorrect.

Choice (D) has correct parallelism and it is well-organized. Notice that, while “who” and “whom” always refer to people, the possessive pronoun “whose” can apply either to people to inanimate things. Here, it’s perfectly correct in applying to “process.”

Choice (E): Problem #1—on the GMAT, the word “where” should apply to real physical locations; the GMAT frowns on applying “where” to abstract ideas, such as “process.” Problem #2—the noun “recoil” is singular, and the parallel verbs “push … and transform” are plural. While the parallelism is flawless here, that’s a SVA error. This choice is incorrect.

The only possible choice is (D).