Answer:
Acetylcholine.
Step-by-step explanation:
Alzheimer's disease may be defined as the neurodegenerative disorder that result in the decrease in the thinking and memory skill of the individual. The connection between the nerve cells get decrease.
Acetycholine is the important transmitter present in the brain that helps in the transmission of nerve impulse in the body. The amount of the acetylcholine gets decreases in the Alzheimer's disease and causes the degeneration of the motor loss.
Thus, the correct answer is option (B).