Bobby Has Been Using Cocaine for the Last Few Weeks

Bobby has been using cocaine for the last few weeks. Instead of snorting it, he has moved on to smoking crack. Which of the following explanations of smoking (relative to snorting) cocaine's physiological effects is accurate? 

A) Smoking crack gives the drug a longer half-life relative to snorting it in powder form.
B) Smoking crack is a rite of passage for many cocaine users and this amplifies physiological effects.
C) Smoking crack allows quicker absorption into the bloodstream.
D) Snorting cocaine through nasal passages is an inefficient way of getting the drug to the brain.