Which of the Following Statements About an Electrochemical Gradient Is

Which of the following statements about an electrochemical gradient is FALSE?

A) It involves a concentration gradient and the membrane potential.
B) It involves a concentration gradient and the total electrical gradient.
C) It is the driving force for the movement of charged and uncharged substances across a membrane.
D) Plant cells maintain an electrochemical gradient across the plasma membrane.
E) Plant cells maintain an electrochemical gradient across the tonoplast.