The description which is an example of an allegory is option B. William Spenser's The Faerie Queene follows the quests of several knights who seek to better themselves, but it symbolically gives honor to Queen Elizabeth I and her kingdom.
The allegory is a litterary device, a metaphor in which a character, place or event is employed in order to deliver a broader message about real-world issues and occurrences.
An allegory is a story which two meanings. The first is the basic meaning of the story. In this example, the basic story is the knights on their quests. The second level of meaning is the symbolic meaning. The story depicts some bigger subject outside of the story. In this example it symbolically shows honor to the Queen and her kingdom.