Which one of these plays is written by Eugene O'Neill?

The play "Long Day's Journey Into Night" is indeed written by Eugene O'Neill. It is considered one of his masterpieces and delves deeply into the complexities of family dynamics, addiction, and the personal struggles of its characters. O'Neill's semi-autobiographical work reflects his own family experiences and is notable for its intense emotional depth and character development.

In contrast, "A Raisin in the Sun" is authored by Lorraine Hansberry and explores themes of race, dreams, and family aspirations; "Death of a Salesman" is penned by Arthur Miller and critiques the American Dream through the life of Willy Loman, an aging salesman; and "No Exit" is written by Jean-Paul Sartre and focuses on existentialist themes through the interactions of characters in a hellish afterlife. Each of these plays has distinctive thematic and stylistic features that set them apart from O'Neill's work.