The three rivers that must be crossed by the spirits of dead people in the realms of Hades were（）， Cocytus and Styx.

The three rivers that must be crossed by the spirits of dead people in the realms of Hades were（）， Cocytus and Styx.
A.Acheron
B.Lethe
C.Elysium
D.Phlegethon
正确答案：Acheron