Sequence the steps of the light reactions from the beginning (Photosystem II) until the end (ATP synthase).
a) Excitation of electrons, electron transport chain, chemiosmosis, ATP synthase
b) ATP synthase, electron transport chain, excitation of electrons, chemiosmosis
c) Electron transport chain, chemiosmosis, excitation of electrons, ATP synthase
d) Excitation of electrons, ATP synthase, electron transport chain, chemiosmosis