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Sentence Correction: Subject Verb Agreement - X of Y Subject

Although its scientific validity has sometimes been called into question, the notion of repressed memories remain a cornerstone of psychological theorizing about the effects of trauma.

Incorrect.

This answer choice is grammatically incorrect. The subject of this sentence is the notion, which is singular and does not agree with the plural verb remain

[[snippet]]

Incorrect.

While this answer choice corrects the Subject Verb Agreement mistake in the original sentence by replacing  the plural verb remain with the singular verb remains, it is stylistically flawed. The phrase having repressed memories is redundant. The original phrase repressed memories is more concise and conveys the same meaning. 

Incorrect.

This answer choice repeats the Subject Verb Agreement mistake in the original sentence. The singular subject is the notion, which does not agree with the plural verb remain.

[[snippet]]

In addition this answer choice is stylistically flawed. Although similar in meaning, the phrase repressing one's memories is less concise than repressed memories. 

Incorrect.

Although this answer choice corrects the Subject Verb Agreement mistake in the original sentence by replacing the plural verb remain with the singular verb remains, it is stylistically flawed. The phrase a cornerstone under is non-idiomatic. The correct usage is a cornerstone of.

Very good.

This answer choice corrects the Subject Verb Agreement mistake in the original sentence by replacing the plural verb remain with the singular verb remains, so that it correctly agrees with the singular subject the notion.

[[snippet]]

 

repressed memories remain a cornerstone of psychological theorizing about the effects of trauma
having repressed memories remains a cornerstone of psychological theorizing about the effects of trauma
repressed memories remains a cornerstone of psychological theories about the effects of trauma
repressing one's memories remain a cornerstone of psychological theorizing on trauma's effects
repressed memories remains a cornerstone under psychological theorizing about the effects of trauma