Select the Basic Principle in Passive Transport by Which Most

Select the basic principle in passive transport by which most drug molecules diffuse through cell membranes.

A) Drug passes from an area of high concentration to an area of low concentration.
B) Drug passes from an area of low concentration to an area of high concentration.
C) Drug passes from an area of high concentration to an area of high concentration.
D) Drug passes from an area of low concentration to an area of low concentration.