31. Which of the following statements concerning fluorescence is INCORRECT?
(A) The fluorescence lifetime of small molecules is typically on the order of nanoseconds.
(B) The fluorescence quantum yield is dependent of excitation power under normal experimental conditions.
(C) Fluorescence occurs from the relaxation of an excited singlet state to the ground singlet state.
(D) Fluorescence emission generally occurs at a longer wavelength than the excitation light due to the Stokes shift.
(E) Fluorescence quenching can occur via dynamic or static mechanisms.