Which of the following is the correct explanation for why the photoelectric effect explains the unique absorption spectr

[answerhappygod]

Which of the following is the correct explanation for why the
photoelectric effect explains the unique absorption spectra of all
elements?
The Photoelectric Effect proved that electrons absorb the energy
of light and add it to their own kinetic energy
The Photoelectric Effect proved that the electrons of different
elements only absorb specific frequencies of light *****
The Photoelectric Effect proved that the electrons are the
subatomic particles that are able to absorb different colors of
light
The Photoelectric Effect proved that the nuclei of atoms do not
play a role in the absorption/emission of specific frequencies