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Researchers have struggled to pinpoint specific causes for hiccups, which happen when a person's diaphragm contracts ________. However, neuroscientist Kimberley Whitehead has found that these uncontrollable contractions may play an important role in helping infants regulate their breathing.

Which choice completes the text with the most logical and precise word or phrase?
Difficulty: Easy
A:

involuntarily

B:

beneficially

C:

strenuously

D:

smoothly

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