Answer:
Option c ==> constricting the blood vessels and possibly decreasing testosterone in the blood.
Step-by-step explanation:
Nicotine is a drug with high addiction level and it is used for stimulation that is to say as stimulant and it has the chemical formula of C₁₀H₁₄N₂ with density of 1.01 g/cm3. Nicotine intake is very harmful to the body because it can can cause heart related diseases such as an heart attack. Nicotine can be found in various products such as tobacco(pipe), cigarettes and so on.
Nicotine affect sexual motivation through option 'c' that is; ''constricting the blood vessels and possibly decreasing testosterone in the blood''.