Answer:
The purpose of using vernacular is to allow readers to understand the language of a work. It is important to connect to readers, and if the language being used isn't understood, this will not be possible. All books could be understood.
A French Romance Writer: Chrétien de Troyes
A French Author from the Enlightenment: Voltaire
The Grand Master of French Literature: Victor Hugo
The Founder of Realism in French Literature: Honoré de Balzac
George Sand: a Feminist French Author
A Swashbuckler in Verse: French Playwright Edmond Rostand
A Lyrical French Writer: Marcel Proust
A Political French Writer: Émile Zola
French Poet Charles Baudelaire
The Traveling French Writer: Gustave Flaubert
Explanation:
Each writes on their own distinct subject.