Final answer:
Option (c), The passage about Dorothy L. Sayers is an example of expository writing, as it provides factual information about her life and work in a clear, informative manner.
Step-by-step explanation:
The type of writing used to create the passage about Dorothy L. Sayers is expository. Expository writing is intended to explain or describe something, providing facts and information to the reader in a clear and straightforward manner. This passage details Sayers's life, her education at Oxford University, her various works, and accomplishments as a writer, which aligns with the characteristics of expository writing.