UV light has enough energy (>100 kJ/mol) to break bonds, and IR light has enough energy (1-5 kJ/mol) to cause vibrations. Radio frequency light has energy of about 0.0001 kJ/mol. What can such a small amount of energy accomplish?

a) Changing the orientation of a molecule in a magnetic field

b) Changing the orientation of functional groups in a magnetic field

c) Changing the spin orientation of a proton in a magnetic field