Which of the following statements) is are False l).  

Fluorescence stops right after the source of excitatory radiation is switched off, whereas for phosphorescence an afterglow with durations of fractions of a second up to hours can occur 

II).  Fluorescence is an absorption process in which atoms or molecules are excited by the absorption of electromagnetic radiation 

lII). Gaseous atoms fluoresce when they are exposed to radiation that has a wavelength that exactly matches that of one of the absorption (or emission lines When citation and emission wavelengths are the same, the resulting emission is called resonance fluorescence.

 Select one 

a). Only II 

b). I and III 

c). Only III 

d). Only I