why do you think that costs are singular?
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Yes agreed that singular verb 'has' must have a singular subject. Which is correct A or C?

Doesn't C alter the meaning by saying that there is only 1 cost. 'The rising cost'
But if we stick with A instead, is 'rising of costs' idiomatic?

I would go with A....what is the OA please?

I would go with C

here we need to make sure that the whole sentence agrees in number and in tense

The rising of costs of data-processing operations at many financial institutions has created a growing opportunity for independent companies to provide these services more efficiently and at lower cost．

as has is singular we need "cost" which is singular

hi.
what is wrong with A? the rising of costs is also singular.
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Let me take this wonderful opportunity as a best friend of you all and explain the intricacies of what I call - The Subject-verb-modifier/quantifier agreement rule.

verbs and modifiers such as adjectives/adverbs need to take different forms depending on singularity or plurality of the nouns and relative pronouns, especially for count and non-count nouns. for a count noun, the modifier becomes plural and thereby verb needs to be plural, likeways with non-count nouns. sometimes quantifier/modifier is singular such as each, every etc while the noun may be a count noun or plural in nature, verb becomes singular following the quantifier/modifier. Also, a conjunction such as "and" is required between two singular nouns to create a plural verb. sometimes, quantifiers may be used incorrectly. replacing with appropriate quantifier may solve the sentence correction.

In the given sentence, noun is operations (countable) but quantifier is assigned to cost (verb) and that is rising (adverb). Rising is singular so "costs" has to become singular. Also, there is no hard-and-fast rule that nouns alone can be subjects of the sentences. The "of" is connecting the actual intent of the sentence with something related to it - "The rising cost of data-processing operations" thereby, "rising cost" becomes the subject, which is entirely singular and therefore, "has" is used.

The Answer is undoubtedly C.
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"The rising of cost" ( a singular subject ) ........ has(singular verb) ........

so clearly the answer is C

Even if you consider ' of ... operations ' -- a raise in their price is still a singular subject

so C is undoubtedly correct

I have chosen C for this question:

A. "The rising of costs" is wordy. Also, "rising" is the subject of the sentence and does not make sense with "has created."

B. Subject verb agreement error - costs does not agree with the singular "has created."

C. This is the correct answer. Subject verb agreement is obeyed.

D. "Because" introduces a subordinate clause, but there is no independent clause to finish off the sentence. Therefore, this is a sentence fragment.

E. "Because" creates a sentence fragment. Also, "costs" is plural and does not agree with the singular "has created."

I study the video multiple times but not understand Why A is wrong.

Pls, explain fully Why A is wrong? e-gmat expert. pls

E-gmat and methevoid,
Is A also wrong because of the construction:

X of Y of Z

I vaguely remember reading in manhattan forums that such a construction is avoided by GMAT.
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