The Opening of Stomata in the Light Involves _______, and Closing

The opening of stomata in the light involves _______, and closing in the dark, _______.

A) facilitated diffusion of K⁺ into guard cells; passive efflux of K⁺ from guard cells
B) the passive uptake of K⁺ by guard cells; active efflux of K⁺ from guard cells
C) the active uptake of H⁺ by guard cells; passive efflux of H⁺ from guard cells
D) loss of water from guard cells; uptake of water by guard cells
E) Both a and d

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