Biology

The correct answer is: A.protein

Explanation:

Proteins often require active transport to enter or leave a cell because they are large, charged, or polar molecules. These characteristics prevent them from easily passing through the lipid bilayer of the cell membrane via simple diffusion or facilitated diffusion. Instead, they typically use membrane transport proteins like pumps or vesicles that consume ATP to move them across the membrane.

Why the other options are incorrect:

B.Water: Water typically moves across the cell membrane via osmosis,...