Dale’s carry instructions from his central nervous system to his muscles.

Dale’s motor neurons carry instructions from his central nervous system to his muscles.

Motor neurons are special brain nerve cells that transmit impulses from the brain or spinal cord to a muscle or gland. The motor neurons functions with a network of other neurons, situated within the spinal cord and the brain. The two main subtypes of the motor neurons are; the upper motor neurons (which comes from the brain and connects with the lower motor neurons), and the lower motor neurons (which localize in the brainstem and the spinal cord).  

answer; i believe the correct answer is (replication is not conservative);

correct answer is a. and d.