Concept:Synecdoche is a figure of speech where a part of something is used to represent the whole.
Explanation:The question asks for the literary device that uses a significant part to represent the whole.
This device is synecdoche.
An example is "All hands on deck," where "hands" refers to the sailors or the whole persons.
Option A, allegory, is a narrative that has a hidden symbolic or moral meaning.
Option B, a pun, is a witty play on words that have similar sounds or multiple meanings.
Option D, cast, is the term for the actors performing in a play.
Therefore, only synecdoche perfectly matches the given definition.
Answer:C. synecdoche