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Sentence Correction: Pronoun Questions - Ambiguity

Differential diagnosis must be the basis for treatment of epilepsy, since there are symptoms of brain trauma, such as seizure-like neurological events, behavior changes, or memory problems that may mimic this condition.

Incorrect.

This answer choice is stylistically flawed. The pronoun this is ambiguous because it can refer either to brain trauma or epilepsy.

[[snippet]]

In addition, the phrase there are is unnecessarily wordy.

Incorrect.

This answer choice repeats the ambiguity mistake in the original question. The pronoun this is ambiguous because it can refer either to brain trauma or epilepsy.

[[snippet]]

Well done!

This answer choice corrects the Ambiguity mistake in the original question by changing this condition to epilepsy.

Incorrect.

While this answer choice corrects the Ambiguity mistake in the original question by changing the pronoun this to epilepsy, it is stylistically flawed. When introducing examples, such as is stylistically preferable to like.

Incorrect.

While this answer choice corrects the Ambiguity mistake in the original question by placing this condition at the beginning of the underlined part so that it refers exclusively to epilepsy, it is stylistically flawed.

Using the passive form (may be mimicked) creates redundancy. Since there is another grammatically correct answer choice that does not use the passive form, it is preferable to this one.

there are symptoms of brain trauma, such as seizure-like neurological events, behavior changes, or memory problems that may mimic this condition

seizure-like neurological events, behavior changes, or memory problems, which are symptoms of brain trauma, may mimic this condition
symptoms of brain trauma, such as seizure-like neurological events, behavior changes, or memory problems may mimic epilepsy
symptoms of brain trauma, like seizure-like neurological events, behavior changes, or memory problems may mimic epilepsy
this condition may be mimicked by symptoms of brain trauma, such as seizure-like neurological events, behavior changes, or memory problems