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Sentence Correction: Subject Verb Agreement - A Plural Subject Consisting of Singular Nouns that are Connected by 'and'

White blood cells, red blood cells, platelets and plasma, which makes up 55% of the volume of normal blood, is the main component of blood.

Incorrect.

This answer choice is grammatically incorrect. The plural subject White blood cells, red blood cells, platelets and plasma does not agree with the singular verb is.

[[snippet]]

In addition, since there are several components of blood, the use of the singular component is illogical

Incorrect.

While this answer choice corrects the original Subject Verb Agreement mistake and is grammatically correct, it is illogical. The sentence lists four different components of blood, yet uses the singular form component.

Incorrect.

While this answer choice corrects the original Subject Verb Agreement mistake and is grammatically correct, it changes the meaning of the original sentence by omitting the words up and main

Incorrect.

This answer choice repeats the original Subject Verb Agreement mistake. The plural subject White blood cells, red blood cells, platelets and plasma does not agree with the singular verb is.

[[snippet]]

Also, this answer choice changes the meaning of the original sentence by omitting the words of the volume.

Very good!

This answer choice corrects the original Subject Verb Agreement mistake, by changing the singular verb is to the plural verb are, and corrects the logical error by changing the singular noun component to the plural noun components.

[[snippet]]
up 55% of the volume of normal blood, is the main component
up 55% of the volume of normal blood, are the main component
up 55% of the volume of normal blood, are the main components
55% of the volume of normal blood, are the components
up 55% of normal blood, is the main components