Which work is NOT authored by Edna St. Vincent Millay?

The correct answer is that "Dulce et decorum est pro patria mori" is not authored by Edna St. Vincent Millay. This poem was actually written by Wilfred Owen, a British poet renowned for his poignant portrayals of the brutal realities of World War I. "Dulce et decorum est pro patria mori" critiques the glorification of war and exposes its horrific consequences.

In contrast, the other works listed are indeed written by Edna St. Vincent Millay. "First Fig" is a well-known sonnet that showcases her characteristic brilliance with language and depth of emotion. "I, Being Born a Woman and Distressed" reflects themes of femininity and sexuality, which were significant elements of Millay's body of work. "Marriage a la Mode" satirizes societal norms regarding marriage and conformity, further illustrating Millay's engagement with contemporary issues and her innovative poetic style. Each of these works contributes to Millay's reputation as an influential voice in early 20th-century poetry.