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Sentence Correction: Subject Verb Agreement - X of Y Subject

Because the number of visitors to the Galapagos islands have almost tripled since 1990, concern for the well-being of the area has heightened, and conservationists are now considering new actions in order to protect it.

This answer choice is grammatically incorrect.

The number of visitors is an X of Y subject. In such cases, the verb should agree with X (number), which is singular. However, the verb have is plural.

The Stop Sign that helps us identify this question as a Subject Verb Agreement question as well as identify this mistake is:

- 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 number of visitors is an X of Y subject. In such cases, the verb should agree with X (number), which is singular. However, the verb have is plural.

The Stop Sign that helps us identify this question as a Subject Verb Agreement question as well as identify this mistake is:

- The subject is in the form of X of Y

Great work!

This answer choice corrects the original Subject Verb Agreement error by matching the singular subject number of visitors with the singular verb has.

Although this answer choice corrects the original Subject Verb Agreement error by matching the singular verb has to the singular subject number of visitors, it uses the incorrect preposition after concern.

The correct idiom is concern for.

Although this answer choice corrects the original Subject Verb Agreement error by matching the singular verb has to the singular subject number of visitors, it uses the incorrect preposition after visitors.

The correct idiom is visitors to.

Because the number of visitors to the Galapagos islands have almost tripled since 1990, concern for the well-being of the area has heightened, and conservationists are now considering new actions in order to protect it
Because the number of visitors to the Galapagos islands has almost tripled since 1990, concern as the well-being of the area has heightened, and conservationists are now considering new actions in order to protect it
Because the number of visitors to the Galapagos islands has almost tripled since 1990, concern for the well-being of the area has heightened, and conservationists are now considering new actions for its protection
Because the number of visitors in the Galapagos islands has almost tripled since 1990, concern for the well-being of the area has heightened, and conservationists are now considering new actions in order to protect it
Concern for the well-being of the Galapagos islands has heightened, and conservationists are now considering new actions in order to protect them because the number of visitors to the area have almost tripled since 1990