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rss GMAT Practice Question (One of Hundreds)
The rising rates of obesity in America has caused serious concern among parents, which has caused many changes in the way children are raised, even including a drastic change in diet for Sesame Street's Cookie Monster.
Correct Answer: D
Make sure that the subjects and verbs agree. Remember the subject of a sentence cannot be the object of a prepositional phrase. A participial phrase at the beginning of a sentence modifies the word that immediately follows it; a participial phrase in the middle of a sentence modifies the word that immediately precedes it.

In this sentence rates, the subject of the sentence, is a plural noun; therefore, the verb has caused (preceding serious) should be in the plural form have caused. The pronoun which that starts the adjective clause refers to concern a singular noun, which makes the singular form of the verb has caused correct in this part of the sentence.

  1. The verb has caused (preceding serious) should be in the plural form have caused in order to agree with the subject, rates.
  2. The participle causing incorrectly modifies parents. Although in this situation the parents are a part of the cause. The participle causing should modify the whole sentence, not only the parents.
  3. The pronoun which that starts the adjective clause refers to concern a singular noun, and the verb have caused should be in the singular form in order to agree with concern.
  4. The subject of the sentence, rates agrees with the verb, have raised. The pronoun which that starts the adjective clause refers to concern a singular noun, which make the singular form of the verb has caused correct in this part of the sentence.
  5. The verb has caused (preceding serious) should be in the plural form have caused in order to agree with the subject, rates. The pronoun which that starts the adjective clause refers to concern a singular noun, and the verb have caused should be in the singular form in order to agree with concern.