Biology

The correct answer is A.active transport.

Explanation:

The sodium-potassium pump moves Na⁺ (sodium ions) and K⁺ (potassium ions) against their concentration gradients, which means sodium is pumped out of the cell where its concentration is higher, and potassium is pumped into the cell where its concentration is lower. This process requires energy in the form of ATP.

Since active transport is the movement of molecules or ions against their concentration gradient and requires energy, the sodium-potassium pump is an example of active transport.

Why the other options are incorrect:

B.Passive transport: This involves the movement of molecules down their concentration grad...