Question

complete the sentence.
reflexes and automatic functions such as heart rate and digestion, but it also controls the movement of eyes, arms, and legs.
not only does the brain stem control
the brain stem controls not only

Explanation:

The sentence uses the "not only...but also" structure. The phrase after the blank connects to "reflexes and automatic functions" (the object of "control"), so the correct option should end with "control" to match the structure. "The brain stem controls not only" fits because it leads into the first part of the "not only...but also" pair, where "not only" precedes the first set of controlled functions, and "but also" introduces the second set.

Answer:

The brain stem controls not only