Which of the following levels or types of meaning might be the underlying story of an allegory? Select all that apply.

psychological
literal
historical
religious
moral

moral

Explanation:

a story, poem, or picture that can be interpreted to reveal a hidden meaning, typically a moral or political one.

The author wanted to get more audience by doing this. Additionally, Defoe always depicted the struggles and conditions of the middle class. Indeed, the writer himself was also from middle class family. There is a book titled "Daniel Defoe and Middle-Class Gentility" which discusses it deeply.