What Is the Primary Difference Between Diffusion and Facilitated Diffusion

What is the primary difference between diffusion and facilitated diffusion?

A) One is active and the other is passive.
B) One requires ATP and the other doesn't.
C) Diffusion involves the movement of a substance from high concentration to a lower concentration. Facilitated diffusion moves a substance from a lower concentration to a higher concentration.
D) Facilitated diffusion uses a "helper" molecule to move a substance passively.

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