Phytochromes are active in

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(C) Phytochromes exist in two interconvertible forms: $Pr$ (which absorbs red light) and $Pfr$ (which absorbs far-red light).$Pr$ is the inactive form

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Red light

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(C) Phytochromes exist in two interconvertible forms: $Pr$ (which absorbs red light) and $Pfr$ (which absorbs far-red light).$Pr$ is the inactive form that absorbs red light $(660 \ nm)$ and converts into the active $Pfr$ form.$Pfr$ is the physiologically active form that absorbs far-red light $(730 \ nm)$ and converts back into the $Pr$ form.Therefore,phytochromes are primarily characterized by their sensitivity to red and far-red light,making red light the correct stimulus for activation.

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