b) The energy of the electron is quantized.
According to Bohr's model, the electron moves in circular orbits around a central nucleus and can only orbit stably in certain fixed circular orbits at a discrete set of distance from the nucleus.
But, we came to know that the energy of the electron in a given orbit is not fixed, thus the statemnet "an electron moves in a circular orbit around the nucleus" is not a valid statement stated.
Thus, option (C) "An electron moves in a circular orbit around the nucleus" is correct.
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