Answer:
A. Title of an essay. 
Step-by-step explanation:
The title of an essay should have quotation marks because it is a small piece of work, such as a poem, a song or an article. 
On the other hand, the title of a book (or a novel), a magazine or a play use italics because they are larger pieces of work. 
For example:
"Ode to a Grecian Urn" by John Keats (a poem) 
Kindred by Octavia E. Butler (a novel)