The right answer is c, he is creating a drug antagonism interaction.
Amphetamines are a family of synthetic products that are highly stimulating on the psyche and the body.
Amphetamines are psychostimulant substances, discovered by the Romanian chemist Lazar Edeleanu in 1887.
Amphetamines all involve psychic and physical dependence which explains their classification as narcotic.
They cause psychic effects corresponding to an artificial maniac syndrome, and serious but rare side effects such as cardiac damage exposing to serious discomfort that can lead to death.
