Choose the statement that best describes how illumination by monochromatic light affects the oxidation state of electron carriers. Illumination by 700 nm light activates electrons in PSI and reduces NADP , draining PSI of electrons. Electron carriers replace these electrons and become oxidized. Illumination by 680 nm light activates electrons in PSI which are passed on to the electron carriers, reducing them. Illumination by 700 nm light activates electrons in PSI which are passed on to the electron carriers, reducing them. Illumination by 680 nm light activates electrons in PSI and reduces NADP , draining PSI of electrons. Electron carriers replace these electrons and become oxidized.