Options:
A.
B.
C.
D.
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Earlier discussion
2 older comments kept for context.
John Kenny Ade
Gland and muscle are refered to as effector organ therefore the answer is D
Oluwaseun Adeyemi
Effector organs are smooth muscle, cardiac muscle and glands that respond to nerve impulses from the central nervous system without conscious thought. They are part of the automatic, or involuntary, nervous system, along with receptors, afferent nerves and efferent nerves.