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Sentence Correction: Subject Verb Agreement - X of Y Subject

In national and international companies, before developing a new product, a team of researchers are allocated to investigate the market.

This answer choice is grammatically incorrect. The singular subject team of researchers does not agree with the plural verb are.

What helps us identify this question as a Subject Verb Agreement question as well as identify this mistake is the following Stop Sign:

The subject is in the form of X of Y

This answer choice is grammatically incorrect and repeats the original Subject Verb Agreement error. The singular subject team of researchers does not agree with the plural verb are.

What helps us identify this question as a Subject Verb Agreement question as well as identify this mistake is the following Stop Sign:

The subject is in the form of X of Y

Although this answer choice corrects the original Subject Verb Agreement error by matching the singular verb is to the singular subject team, using as well as instead of and is redundant.

What helps us identify this mistake is the following Stop Sign:

as well as

Although this answer choice corrects the original Subject Verb Agreement error by matching the singular verb is to the singular subject team, it creates Redundancy with the wordy phrase In national companies and in international companies.

Nice!

This answer choice corrects the original Subject Verb Agreement error by matching the singular verb is to the singular subject team

national and international companies, before developing a new product, a team of researchers are allocated to investigate the market
national companies and in international companies, before developing a new product, a team of researchers is allocated to investigate the market
national as well as international companies, before developing a new product, a team of researchers is allocated to investigate the market
national and international companies, a team of researchers are allocated to investigate the market before developing a new product
national and international companies, before developing a new product, a research team is allocated to investigate the market