Which of the following options demonstrates correct sentence structure?

Question

Quizplus · Accepted Answer

Parallel ideas are those that have the same level of importance within a sentence. In order to show this, we need to use parallel structure. Depending on the sentence, we may need to use parallel words, phrases, or clauses (this means that the words, phrases, or clauses use the same grammatical structure). Typically, we join parallel structures with conjunctions such as "and" and "or."
In this example, we need to make sure the two ideas (the topics being discussed) have parallel structure.
We discussed the differences between the consequences of the Great Depression and the consequences of the global financial crisis of 2009.
This sentence is grammatically correct because it uses parallel structure to show that the speaker was discussing the consequences of both the Great Depression and of the global financial crisis of 2009.
We discussed the differences between the consequences of the Great Depression and how bad the global financial crisis of 2009 was. does not have a parallel structure because it adds in "how bad" rather than using "consequences." This change results in a sentence without a parallel structure.
We discussed the differences between the Great Depression and the consequences of the global financial crisis of 2009. does not have a parallel structure because it does not include "consequences" in the first part of the sentence. This change results in a sentence without a parallel structure.
We discussed the differences between how awful the Great Depression was and what consequences the global financial crisis of 2009 had. is not grammatically correct. In this case, the ideas discussed are: "how awful the Great Depression was" and "what consequences the global financial crisis of 2009 had." The phrasing of the two ideas being compared are not written using parallel structure.

Which of the Following Options Demonstrates Correct Sentence Structure