The link between cannabis use and amotivational syndrome
a. is supported by laboratory experiments in which rhesus monkeys exposed to marijuana smoke were less willing to work for tasty treats.
b. is supported by inpatient hospital findings that, with abstinence from cannabis, the severity of amotivational symptoms decreased significantly in humans.
c. is supported by a direct correlation between the degree of motor retardation and blood serum levels of cannabinoids and their metabolites.
d. is not supported by the finding that, once enrolled in college, students who smoke cannabis demonstrate comparable or even higher grades than their cannabis-abstinent classmates.
e. All of the above are true.
Answer: E
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