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Sentence Correction: Subject Verb Agreement - Ving/to V Subject

Most people want to have children at some point in their lives, but not all of them realize that raising children are hard work, both physically and mentally.

You're right!

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

Incorrect.

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

Incorrect.

While this question is grammatically correct, it changes the meaning of the original sentence by omitting the word raising. Since there is an answer choice that is also grammatically correct and is more loyal to the original meaning, it is superior to this one.   

Incorrect.

This answer choice is grammatically incorrect as the plural subject children does not agree with the singular verb is

Incorrect.

This answer choice repeats the original Subject Verb Agreement mistake: the singular subject raising children does not agree with the plural verb are.

Most people want to have children at some point in their lives, but not all of them realize that raising children are hard work, both physically and mentally
People want to have children at some point in their lives, but not all of them realize that  children are hard work, both physically and mentally
Most people want to have children at some point in their lives, but not all of them realize that, both physically and mentally, children is hard work 
Most people want to have children at some point in their lives, but not all of them realize that raising children is hard work, both mentally and physically
Most people would like to have children at some point in their lives, but not all of them realize that, both physically and mentally, raising children are hard