When an Organic Molecule Is Irradiated with Ultraviolet Radiation,the Energy

When an organic molecule is irradiated with ultraviolet radiation,the energy absorbed by the molecule corresponds to:

A) the amount necessary to increase molecular motions in functional groups
B) the amount necessary to excite electrons from one molecular orbital to another
C) the amount necessary to "flip" the spin of atomic nuclei
D) the amount necessary to strip a molecule of one electron to generate a radical cation