Following Rutherford, Niels Bohr developed an improved model of the atom in which the electrons moved around the nucleus in quantized energy shells. Which of the following phenomena could Bohr's model explain but Rutherford's model could not?

Group of answer choices:

spectral emission lines from hydrogen atoms

wave-particle duality of electrons

protons accounting for roughly half of an atom's mass

alpha particles passing through gold foil undeterred