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

Automotive engineers, applying mathematical, mechanical, and structural knowledge, knows that the more aerodynamic a vehicle, the less fuel it wastes.

This answer choice is grammatically incorrect. The plural subject Automotive engineers does not agree with the singular verb knows.

What helps us identify this question as a Subject Verb Agreement question as well as identify the mistake is the following Stop Sign:

A long complex subject / a long distance between the subject and the verb

Although this answer choice corrects the original Subject Verb Agreement error by matching the plural subject Automotive engineers with the plural verb know, it is grammatically incorrect. This question uses a Double Comparative. The second part of a Double Comparative must begin with the word the. In this answer choice, however, it begins with the word it.

Although this answer choice corrects the original Subject Verb Agreement error by matching the plural subject Automotive engineers with the plural verb know, it is grammatically incorrect. This question uses a Double Comparative. The second part of a Double Comparative must begin with the word the. In this answer choice, however, it begins with the word it.

Although this answer choice corrects the original Subject Verb Agreement error by matching the plural subject Automotive engineers with the plural verb know, it is stylistically flawed as it creates Redundancy by using the wordy phrase that a vehicle is an aerodynamic vehicle.

That's right!

This answer choice corrects the original Subject Verb Agreement error by matching the plural subject Automotive engineers with the plural verb know.

knows that the more aerodynamic a vehicle, the less fuel it wastes
know that the more aerodynamic a vehicle, it will waste less fuel
know that the more aerodynamic a vehicle, the less fuel it wastes
know that the more aerodynamic a vehicle, it wastes less fuel
know that the more that a vehicle is an aerodynamic vehicle, the less fuel it wastes