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Sentence Correction: Subject Verb Agreement - A Complex Subject/Long Distance between Subject and Verb

To recite wedding vows is simple; to be able to keep them for years is the real challenge.  

Very good!

This answer choice is grammatically correct.

Incorrect.

This answer choice is grammatically incorrect. The singular subject To recite does not agree with the plural verb are.

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Incorrect.

This answer choice is grammatically incorrect. The singular subject to be able does not agree with the plural verb are.

[[snippet]]

Note that the subject To be able is a little far from the verb are. Moreover, the plural noun years appears right before the plural verb are. This is done intentionally, to trick test-takers into mistaking years for the subject and failing to identify the Subject Verb Disagreement

Incorrect.

This answer choice contains two grammatical mistakes. The singular subject to recite does not agree with the plural verb are, and the singular subject to be able does not agree with the plural verb are.

Note that the subject To be able is a little far from the verb are. Moreover, the plural noun years appears right before the plural verb are. This is done intentionally, to trick test-takers into mistaking years for the subject and failing to identify the Subject Verb Disagreement

Incorrect.

This answer choice changes the meaning of the original sentence by omitting the words for years.

is simple; to be able to keep them for years is
are simple; to be able to keep them for years is
is simple; to be able to keep them for years are
are simple; to be able to keep them for years are
is simple; to be able to keep them is