Our understanding was that she would continue to cover the costs of school enrollment and room and board for the children,
which she verbally agreed to pay with the rest of the family.a) which she verbally agreed to pay with the rest of the family.
b) which she agreed verbally with the rest of the family to pay.
c) of which she agreed verbally with the rest of the family to pay.
d) both of which she verbally agreed to pay with the rest of the family.
e) both of which she agreed to pay with the rest of the family verbally.
In the GMAT, when you see a comma followed by "which", the which clause modifies the word directly in front of the "which". Therefore both A and B are incorrect here.
In C, the use of "of which" leaves no clear antecedent.
In E, she is not paying verbally... she verbally agreed to pay
Now, you shouldn't change the meaning of the sentence unless necessary. In the original sentence, it is perfectly valid that she was going to pay with the rest of the family together. in D, "both" refers to the cost of the enrollemnt and room & board. D is grammatically correct and it does not change the meaning of the sentence.
The OA is B, but I feel it is incorrect for the reason presented above.
Here is the official explanation:
This sentence requires the correct placement of the adverb verbally, indicating the way in which the agreement was made, and the correct use of phrases indicating with whom (the rest of the family) the agreement was made.
a) The phrase with the rest of the family is misplaced, making it sound as if the subject of the sentence and the rest of the family were planning to pay the fees together.
b) The adverb verbally comes immediately after the verb agreed, indicating their correlation, and the placement of the phrase with the rest of the family makes it clear that the agreement was between the two parties.
c) The word of is unnecessary and confusing.
d) The phrase with the rest of the family is misplaced, making it sound as if the subject of the sentence and the family were planning to pay the fees together; also the word both is unnecessary and confusing.
e) Verbally is misplaced, making it sound as if the promised payments will be made by speaking.
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