In Defeating the Greek City-States in Southern Italy, Rome

In defeating the Greek city-states in southern Italy, Rome

A) employed mercenary armies from Persia and Asia Minor.
B) faced large, well-trained armies from the Greek colonies.
C) gained a sense of security and demobilized its military.
D) had to fight the soldiers of King Pyrrhus, sent against them by the Greeks.
E) relied upon a large and professional navy.