Rutherford's gold-foil experiment led him to conclude that
a. thomson's plum pudding model of the atom was accurate.
b. alpha particles were a poor choice for a bombardment material.
c. a dense region of positive charge existed somewhere in the atom.
d. light was emitted by electrons returning to ground state.

C. a dense region of positive charge existed somewhere in the atom.

Explanation:

Physicist Ernest Rutherford created the gold foil experiment in which he shot a beam of alpha particles at a sheet of gold foil, which then sent a  few of the particles flying after they were deflected. Based on the information gathered after completing this experiment, Rutherford concluded that a dense region of positive charge existed somewhere in the atom.

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e

explanation:

there is no change in the electric potential energy as it is in rest on both conditions.