Passive transport which statement best describes it?

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Passive transport involves movement of substances down their concentration gradient without using cellular energy. The driving force is the concentration difference, so molecules spread from areas of high concentration to low concentration until equilibrium is reached. This can happen by simple diffusion through the lipid bilayer or by facilitated diffusion through channels or carriers, but no energy is required in any case. The statement that best captures this general idea is that diffusion occurs without energy input and is driven by the concentration gradient. Statements that either specify diffusion only through channels (a narrower case) or claim that diffusion requires energy, or describe active transport, don’t fit the defining feature of passive transport.