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Sentence Correction: Subject Verb Agreement - X of Y Subject

Retirement planners typically begin by looking at a client's sources of income, which is a chief key for predicting future cash flows. 

Incorrect.

While this answer choice corrects the original Subject Verb agreement mistake and is grammatically correct, it changes the meaning of the sentence by changing the word client to clientele.

Incorrect.

This answer choice is grammatically incorrect.

income sources of a client is an X of Y subject. In such cases, the verb should agree with X (income sources), which is plural. However, the verb is is singular

[[snippet]]

Correct!

This answer choice corrects the original Subject Verb Agreement mistake, by changing the singular verb is to the plural verb are, to match the plural subject sources.

[[snippet]]

Incorrect.

This answer choice is grammatically incorrect.

sources of income is an X of Y subject. In such cases, the verb should agree with X (sources), which is plural. However, the verb is is singular

[[snippet]]

Incorrect.

This answer choice is grammatically incorrect.

sources of income is an X of Y subject. In such cases, the verb should agree with X (sources), which is plural. However, the verb is is singular

[[snippet]]
a client's sources of income, which is
clients' sources of income, which is
a client's sources of income, which are
the income sources of a client, which is
sources of a clientele's income, which are