The correct option is B Dopamine
Cocaine or coke or crack, is a natural stimulant. Stimulants are the drugs that stimulate nervous system and increase alertness and excitement. Excess dosage of cocaine can cause hallucinations. It interferes with the transportation of dopamine, a neurotransmitter. Dopamine is a chemical messenger and carries signals or nerve impulses from one brain cell to other. From one neuron to other, dopamine is passed through transporter proteins. Cocaine blocks these proteins which result in high dopamine levels in the synaptic gap and this can cause damage to brain cells.
So, the corret answer is- dopamine.