Final answer:
Bassanio chooses the correct casket based on the value of inner qualities over external appearances, aligning with the central idea that true worth is not determined by outward show. Therefore, the correct option is C
Step-by-step explanation:
The central idea in the last paragraph of the passage is best expressed by statement C. Bassanio is able to identify the correct casket because he does not care for outwardly appearances or fancy things. Bassanio rejects the gold and silver caskets, which represent external allure and wealth, and instead chooses the lead casket, which symbolizes inner value and substance over superficiality. His successful choice validates the theme that true worth lies beyond outward appearances.