Answer:
<em><u>A. Title of an essay. </u></em>
Explanation:
The title of an <u>essay</u> should have <u>quotation marks</u> because it is a <u>small</u> 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 <u>italics</u> because they are <u>larger</u> pieces of work.
<u>For example:</u>
"Ode to a Grecian Urn" by John Keats (a poem)
<em>Kindred</em> by Octavia E. Butler (a novel)