The lesson about obedience and loyalty that is reinforced by Odysseus' orders to his men to plug their ears with beeswax during the Sirens' song is:
C. Disobedience leads to individual destruction, while following orders can ensure collective safety.
This choice highlights the importance of loyalty and obedience in the face of temptations that could jeopardize the safety of the group. By following Odysseus' orders, his men can avoid the destructive allure of the Sirens' song.