In addition to chlorophyll, photosynthetic systems also contain carotenoid pigments. Which statement does NOT describe a function of carotenoid pigments?
a. They participate in photoinduced electron transfer reactions and electron transport.
b. They expand the spectral range over which light is harvested.
c. They absorb light with wavelengths between 400 nm and 500 nm.
d. They provide a protective mechanism against damaging photochemical reactions and reactive oxygen species.