The diagram shows a model cell that transports substance X across the cell membrane. The cell is equipped with a Na+-K+-ATPase pump as shown. Substance X enters the cell by a coupled transport mechanism and exits the cell by carrier-mediated diffusion. Treatment with a substance that inhibits the Na+-K+-ATPase pump inhibits the transport of X by which of the following mechanisms? 
A) Decreased intracellular K+ concentration
B) Decreased intracellular Na+ concentration
C) Increased intracellular K+ concentration
D) Increased intracellular Na+ concentration
Correct Answer:
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