Respuesta :
The correct answer is 'Active Transport'. when the concentration of particles is higher inside the cell and yet for proper functioning we need more ions, the ions are received by the cell by the means of active transport, in which dissolved substances are moved by the help of carrier proteins with the energy released from respiration.
Active transport is movement of dissolved molecules through cell membrane. These molecules move from lower  concentration region to higher concentration region.
If sodium ions are moving from outside cell to inside cell there will be active transport.
As the sodium ions are moving from cells they are crossing the two regions through cell membrane.
The correct answer is C. Active transport.
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