Neurotransmitters are the chemicals present in the body used for the propagation of action potential. These neurotransmitters are also known as the body chemical messengers.
Neurotransmitters are stored in the neural cells. These chemicals are generally released when the cell is stimulated by the specific signal. The effect of neurotransmitter may be excitatory or inhibitory.
It is choice B. Haploid cells contain one copy of genetic information. (ex sperm, egg) Diploid cells contain two copies of the genetic information. (ex muscle, bone brain, eye, etc.)