souvik101990 wrote:
This question is part of the GMAT Club Sentence Correction : Parallelism" Revision Project.
Foods high in tryptophan, an amino acid that is a precursor to serotonin, can help people to fall asleep byreducing anxiety, relaxing the brain, and in regulating the sleep cycle.
A. reducing anxiety, relaxing the brain, and in regulating
B. means of reducing anxiety, relaxing the brain, and in the regulation of
C. reducing anxiety, relaxing the brain, and regulation of
D.reducing anxiety,
...
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