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

The innovative therapeutical program and its newest user interface module includes several groundbreaking modifications through which parent and child explore stunning 3-D landscapes and solve challenging emotional and interpersonal scenarios.

Incorrect.

This answer choice is grammatically incorrect. The plural subject The innovative therapeutical program and its newest user interface module does not agree with the singular verb includes.

[[snippet]]

Correct!

This answer choice corrects the grammatical mistake committed in the original sentence by correctly pairing the plural subject The innovative therapeutical program and its newest user interface module with the plural verb include.

[[snippet]]

Incorrect.

Although this answer choice corrects the original Subject Verb Agreement mistake, it creates a new one. The plural subject parent and child does not agree with the singular verb solves.

The following Stop Signs help us identify this question as a Subject Verb Agreement question and detect this mistake:

- A plural subject made up of singular nouns connected by and

- A long complex subject / long distance between subject and verb 

Did you notice that the verb solve was changed to solves?

Remember, changes in answer choices do not always revolve around the original mistake. Any word in the underlined part is prone to changes. Thus, after you eliminate the answer choices that repeat the original mistake, you need to compare the remaining answer choices word for word in order to detect the differences between them and eliminate all but one of them.   

Incorrect.

This answer repeats the original mistake. The plural subject the innovative therapeutical program and its newest user interface module does not agree with the singular verb is.

[[snippet]]

Incorrect.

Although it corrects the original Subject Verb Agreement mistake, this answer choice changes the meaning of the original sentence and creates an illogical sentence. The program and its user-interface are not groundbreaking modifications; they include groundbreaking modifications. A modification is a small change to the program or interface...it cannot be the program or interface itself.

It's good that you noticed, but this should have triggered you to look at the sentence again and check whether the change introduced a new error. 

includes several groundbreaking modifications through which parent and child explore stunning 3-D landscapes and solve challenging emotional and interpersonal scenarios
include several groundbreaking modifications enabling both parent and child to explore stunning 3-D landscapes and to solve challenging emotional and interpersonal scenarios
include several groundbreaking modifications through which parent and child explore stunning 3-D landscapes and solves challenging emotional and interpersonal scenarios
is a tool with which parent and child explore stunning 3-D landscapes and solve challenging emotional and interpersonal scenarios, using the groundbreaking modifications included
are groundbreaking modifications through which parent and child explore stunning 3-D landscapes and solve challenging emotional and interpersonal scenarios
No, I didn't.
Yes, I did.