When a pigment molecule in a light-harvesting complex absorbs a photon of light, what happens to its excited-state electron?

a) The excited-state electron is passed to electron acceptors P680 or P700.
b) The electron falls back to its ground state, while passing its excited-state energy to an electron in a nearby pigment molecule.
c) The excited-state electron excites electrons in other pigments around it, so that multiple pigments can send electrons to P680 or P700.
d) The excited-state electron is removed and transferred to a nearby pigment molecule, causing the next pigment to enter an excited state.