The process by which excess energy is lost is
A. When an electron of a molecule absorbs a quantum of light it is raised to a higher level of energy a state called excited second singlet state. From first singlet state excited electron may return to the ground state either losing its energy in the form of heat or by losing energy in the form of radiant energy. The latter process is called Fluorescence.
B. Photooxidation is oxidation caused by the action of light.
C. Photolysis- In this oxidized chlorophyll molecule takes replacement electron from water, which splits releasing oxygen.
D. Photophosphorylation is the process of phosphate group transfer into ADP to synthesize energy-rich ATP molecules making use of light as an external energy source.
Hence, the correct answer is 'Fluorescence'.