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Sentence Correction: Redundancy - "as well as"

Salmon oil is an excellent source of Omega-3, one of the essential fatty acids that supports the immune system and promotes health of the heart.

Incorrect.

Although this answer choice corrects the original Relative Clause error by using the plural verbs support and are to match the plural noun fatty acids (one of the essential fatty acids [that]), it creates redundancy with the wordy phrase the promoters of increased.

Very good!

This answer choice corrects the original Relative Clause error by using the plural verbs support and promote to match the plural noun fatty acids

Incorrect.

This answer choice is grammatically incorrect and repeats the original Relative Clause error. The relative clause which supports the immune system and promotes heart health describes the noun that appears immediately before it, namely, one of the essential fatty acids (that), and since this is is plural, the verb that follows it also needs to be plural. However, is and a promoter are singular.

[[snippet]]

Incorrect.

Although this answer choice corrects the original Relative Clause error by using the plural verbs support and promote to match the plural noun one of the essential fatty acids (that), it creates redundancy by using as well as instead of and.

What helps us identify this mistake is the following Stop Sign:

as well as

Incorrect.

This answer choice is grammatically incorrect. The relative clause which supports the immune system and promotes heart health describes the noun that appears immediately before it, namely, one of the essential fatty acids (that) and since this is plural, the verb that follows it also needs to be plural. However, supports and promotes are singular.

[[snippet]]
supports the immune system and promotes
support the immune system as well as promote
support the immune system and is a promoter of
support the immune system and promote
support the immune system and are the promoters of increased