Bunuel
Many tourists seem to be avoiding the Tijuana/Rosarito Beach area because they are experiencing an upsurge in the occurrence of border violence.
(A) seem to be avoiding the Tijuana/Rosarito Beach area because they are experiencing an upsurge in the occurrence of border violence
(B) seem to avoid the Tijuana/Rosarito Beach area because they are experiencing an upsurge of violence on the border
(C) avoid the Tijuana/Rosarito Beach area because they are experiencing an upsurge of border violence occurrence
(D) seem to be avoiding the Tijuana/Rosarito Beach area because it is experiencing an upsurge in the occurrence of border violence
(E) seem to be avoiding the Tijuana/Rosarito Beach area because it experiences an upsurge in the occurrence of border violence
OFFICIAL EXPLANATION:
D. The underlined portion is lengthy, so use your powers of concentration to home in on the potential errors. You see a couple verbs and the pronoun they. Check the pronoun first.
Whenever you see an underlined pronoun, check its reference to make sure it’s clear and that it agrees in number with the noun.
The pronoun they is plural, but the only plural noun in the sentence is tourists. It doesn’t make sense that tourists would be experiencing an upsurge in the occurrence of border violence. It’s more likely that they refers to the beach area, which is experiencing increased violence. Only one area is mentioned, so the pronoun should be singular, it. That narrows your choices considerably. The only two answers that change they to it are Choices (D) and (E). The difference between the two is that Choice (E) changes the verb tense to the simple present. The upsurge is ongoing, so the original progressive tense in Choice (D) is better.