Athens's Return to Economic Health Benefited from Which of the Following

Multiple Choice

Athens's return to economic health benefited from which of the following?

A) The reconstruction of the Long Walls, which connected the city with the port and protected trading vessels and shipbuilding
B) The resumption of intensive gold and platinum mining, which had stopped during the Peloponnesian War
C) New Athenian citizenship laws that encouraged immigration, which was needed to replace the men lost in battle
D) The collapse of the Spartan economy after the helots were freed in 371 B.C.E.