Why Are People More Likely to Die from Overdoses of Opiates

Why are people more likely to die from overdoses of opiates than from overdoses of marijuana?​

A) The brain areas that control heart rate and breathing have few marijuana receptors.
B) ​If marijuana begins to slow heart rate, people become placid and stop using the drug.
C) ​Opiates cause sodium to enter neurons, and marijuana causes potassium to enter.
D) ​Opiates dissolve in the fats of the body, but marijuana does not.