The key characteristics of expository prose are

style, organization, and appropriate vocabulary

style, plot, and characters

characters, style, and organization

appropriate vocabulary, plot, and characters

The key characteristics of expository prose are style, organization, and appropriate vocabulary. This type of prose should be precise and clear and should not contain any qualifiers such as words like: pretty, very, and little. 

When writing expository prose, focus more on using adverbs, adjectives, and verbs to make your writing precise and unique. 

Ithink that the answer is a

Dshould be the answer