What Would You Describe as the Key Result of the Rutherford

What would you describe as the key result of the Rutherford experiment, in which a metal target was bombarded with
$\alpha$ -particles?

A) The $\alpha$ -particles were able to pass through the target.
B) The particles were found to knock electrons out of the target.
C) Some of the $\alpha$ -particles were deflected through large angles.
D) Flashes of light were emitted when the $\alpha$ -particles hit the ZnS screen after they passed through the target.
E) The experiment showed the need for better $\alpha$ -particle detectors.