Among Normal Individuals, Relatively Low THC Concentrations Are Fortunately __________

Among normal individuals, relatively low THC concentrations are fortunately __________.

A) not likely to cause acute emotional problems
B) likely to trigger psychotic symptoms in about 10% of them
C) more dangerous with respect to acute emotional problems than relatively high THC concentrations
D) more likely to trigger psychotic symptoms when smokers are from North America than when they are from Europe