Which Is the Best Definition of Active Transport

Multiple Choice

Which is the best definition of active transport?

A) movement of molecules from an area of their higher concentration to an area of their lower concentration
B) movement of water across a semi permeable membrane from an area of higher water concentration to an area of lower water concentration
C) movement of molecules from an area of their lower concentration to an area of their higher concentration
D) movement of water across a semi permeable membrane from an area of lower water concentration to an area of higher water concentration
E) movement of a substance against its concentration through the release of energy from ATP