Answer:
The quotation from the text that best shapes the theme that loyalty is a foundation of friend ship is "Dionysius watched in disbelief as each friend eagerly sought to give up his life for the other."
Explanation:
This quotation would be the correct answer because it actively shows that they are loyal to each other and tries to give up their lives for each other. Another point from the text that help emphasizes this is that it addresses that they are friends, directly connecting loyalty with friendship. The other quotations would not answer the question correctly because they do not demonstrate the connection of their loyalty to their friendship.