Final answer:
Blepharospasm is the involuntary spasm of the eyelids, which is option A) eyelids. It is not related to the action of the masseter muscle, which is involved in chewing.
Step-by-step explanation:
Blepharospasm is defined as a spasm of the eyelids. This condition can cause the eyelids to blink uncontrollably or to close without voluntary action from the individual. It’s a type of focal dystonia, which is a neurological movement disorder involving involuntary muscle contractions.
The correct answer to the question provided is A) eyelids.
In contrast, the masseter muscle which is involved in the action of chewing, has nothing to do with blepharospasm. It is a facial muscle that plays a crucial role in the mastication process, where b) chewing is the correct action associated with the masseter.