Connie, who has struggled for several months with a heroin addiction, is experiencing withdrawal. What specific symptom(s) of withdrawal might she be experiencing?
a. She obtains a euphoric high.
b. She remains in a cozy, relaxed state after a peak high.
c. None; she just needs more heroin than she is used to in order to feel anything.
d. She feels anxiety, nausea, and tremors.