When alpha particles are sent through a thin gold foil, most of them go straight through the foil

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When alpha particles are sent through a thin gold foil, most of them go straight
through the foil, because
(a) alpha particles are positively charged
(b) the mass of an alpha particle is more than the mass of an electron
(c) most of the part of an atom is empty space
(d) alpha particles move with high velocity