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(D) The most widely accepted and recent explanation for stomatal movement is the $K^+$ ion transport theory (Potassium pump theory).According to this

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Potassium influx and efflux

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(D) The most widely accepted and recent explanation for stomatal movement is the $K^+$ ion transport theory (Potassium pump theory).According to this theory,during the daytime,$K^+$ ions enter the guard cells from the surrounding subsidiary cells,which decreases the water potential of the guard cells.This leads to the endosmosis of water into the guard cells,making them turgid and causing the stomata to open.Conversely,during the night,$K^+$ ions move out of the guard cells,leading to the exosmosis of water,which makes the guard cells flaccid and causes the stomata to close.

Which one gives the most valid and recent explanation for stomatal movement?

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