"if we legalize marijuana, the next thing you know, heroin will be legalized too."

what is fallacious about this statement?

a) it inaccurately portrays drug use as ubiquitous.
b) it suggests that the premise follows from the principle.
eliminate
c) it suggests that the principle follows from the premise.
d) it incorrectly suggests an inevitable "slippery slope" towards a more extreme situation.