A College Student Is Introduced to Methamphetamine, Eventually Needs More

A college student is introduced to methamphetamine, eventually needs more and more to feel good, and soon starts stealing to support her habit. She is expelled from school for stealing from her roommate. Why might she have become addicted so quickly?

A) Methamphetamine converts to morphine in the brain and binds to endorphin receptors that cannot regulate the release of dopamine in her limbic system.
B) She probably has a genetic defect that increases levels of naturally produced dopamine, and the drug decreases stimulation of her dopamine receptors.
C) She probably has an abnormally low amount of naturally produced dopamine in her limbic system due to an addiction- related genetic problem.
D) Increased baseline levels of dopamine in the synapse between her VTA and ACC decreased stimulation of her dopamine receptors upon her first use.