They personified abstract concepts.
Answer: Option D.
Step-by-step explanation:
Morality plays are a type of allegory in which the main character of the play or the story is met with a number of moral attributes of the personality. They want to choose a good life over an evil life because of their moral attributes and values.
In morality plays, the main hero would meet characters who were personified moral attributes. This means that those character would never be fully fleshed characters and thus would be "naive allegories"