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Bunuel
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Kleine-Levin syndrome, a rare neurological disorder primarily affecting adolescents, is characterized by cyclical episodes of extreme lethargy, heightened irritability, and appearing confused.


A. appearing confused

B. they appear confused

C. may be confused

D. apparent confusion --> correct parallelism with "extreme lethargy & heightened irritability "

E. had been confused
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Bunuel
Kleine-Levin syndrome, a rare neurological disorder primarily affecting adolescents, is characterized by cyclical episodes of extreme lethargy, heightened irritability, and appearing confused.


A. appearing confused

B. they appear confused

C. may be confused

D. apparent confusion

E. had been confused

Considering parallel structure, D is the best answer as all the elements are nouns(with adjectives).
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Bunuel
Kleine-Levin syndrome, a rare neurological disorder primarily affecting adolescents, is characterized by cyclical episodes of extreme lethargy, heightened irritability, and appearing confused.


A. appearing confused

B. they appear confused

C. may be confused

D. apparent confusion

E. had been confused

Must be (D) as a list is presented -

Kleine-Levin syndrome, a rare neurological disorder primarily affecting adolescents, is characterized by
    cyclical episodes of extreme lethargy,
    heightened irritability, and
    apparent confusion
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