23. When a plant grows in the shade of other plants, it exhibits the "shade avoidance syndrome," which promotes rapid internode elongation. This occurs because of what change in the environmental light spectrum?
(A) The proportion of blue light increases, activating cryptochromes.
(B) The Red/Far-red (R/FR) ratio decreases, leading to a reduction in the physiologically active Pfr form of phytochrome.
(C) Ultraviolet (UV-B) radiation increases, destroying auxin.
(D) The Red/Far-red (R/FR) ratio increases, leading to an increase in the Pr form of phytochrome.

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