Under what condition will diffusion take place most rapidly?%0D%0A%0D%0A a%0D%0Amovement from an area of low concentration to high concentration%0D%0A b%0D%0Amovement from an area of high concentration to an area of low concentration%0D%0A c%0D%0Amovement through a permanent barrier%0D%0A d%0D%0Amovement against a concentration gradient

b. movement from an area of high concentration to an area of low concentration