What significant information about atomic structure came from the Milikan experiment using charged oil drops?
(A) Millikan showed that cathode rays were identical to a stream of electrons coming from an atom.
(B) Millikan confirmed that the neutron and proton were about the same mass.
(C) Millikan determined that magnitude of the charge on an electron.
(D) Millikan proved that the mass of an atom was concentrated in nucleus.
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