Dopamine is most known for its role in energy and arousal
mood, emotional states, and sleep
motivation, alertness, and reward
muscle movement, learning, and memory
pain reduction and pleasure

Prohibited for an underage student to be in the presence of any other person legally or illegally, consuming or selling alcoholic beverages; i think this is a correct answer

Some connecting rods have to lubricate the cylinder wall or piston pin. the answer is letter d. graphite coating can be a major  additive to many  coating  systems and things such as connecting rods.  it functions as a refractory, lubricant, thermal conductor, and electrical conductor for a machine or thing to enhance its work.