Which of the following interferences in flame photometry occurs because of the absorption of radiant energy through collision with atoms of its own kind present in ground energy level?

This answer is correct as interference due to self absorption occurs due to the absorption of radiant energy through collision with atoms of its own kind present in ground energy level, which primarily depends upon the number of atoms present in ground state. The concentration of atomized solution and by the probability that these atoms will be excited by the incident radiation from excited atoms of its own kind.