Answer:
B). Illustration
Step-by-step explanation:
The adjective 'illustration' stands for 'a demonstration or an example.' Since the given sentence talks about a book which is written in the prose form of the 18th century. Thus, the correct word that most aptly fits the given example would be 'illustration' as the preposition always follows a noun to form the prepositional phrase which is 'illustration' only, the other two are adjectives. Hence, it suggests that the book exemplifies the prose pattern, style, linguistic design, and formats, etc. and therefore, option B is the correct answer.