Exposing a sodium atom in the gas phase to electromagnetic radiation with a wavelength of 598 nm causes the electron to excite from the 3s orbital to a 3p orbital. Which one of the following can produce the same electron excitation in a single gas-phase sodium atom?
(a) The absorption of two photons with a wavelength of 299 nm.
(b) The absorption of two photons with a wavelength of 1196 nm.
(c) The absorption of a photon with a wavelength greater than 598 nm.
(d) The absorption of a photon with a wavelength less than 598 nm.
(e) No other wavelength of light can produce this excitation.