The OA explanation is as below:
The main error in the original sentence is the usage of the word "should." Such usage (equating "should" with "will") is common colloquially, but on the GMAT, "should" always implies "ought to." Applying the correct usage, the sentence would read that 2000 people "ought to" be struck by lightning in a given year. This error needs to be corrected.
Choices (A), (B), and (E) use "should," while choices (C) and (D) replace it with "will."
Choices (A), (B) and (E) are out because of the "should" usage error.
Choice (C) changes the sentences meaning by moving the modifier "2000" from its proper place in front of "people" to a different location, in front of "times," changing its function and altering the meaning of the sentence.
The main error in the original sentence is the usage of the word "should." Such usage (equating "should" with "will") is common colloquially, but on the GMAT, "should" always implies "ought to." Applying the correct usage, the sentence would read that 2000 people "ought to" be struck by lightning in a given year. This error needs to be corrected.
Choices (A), (B), and (E) use "should," while choices (C) and (D) replace it with "will."
Choices (A), (B) and (E) are out because of the "should" usage error.
Choice (C) changes the sentences meaning by moving the modifier "2000" from its proper place in front of "people" to a different location, in front of "times," changing its function and altering the meaning of the sentence.