The event that is part of the falling action in "Romeo and Juliet" is:
D. Juliet and Friar Lawrence devise a plan to fake her death.
In the falling action of a play, the events follow the climax and lead toward the resolution. This event occurs after the climactic moment in the play when the conflict has reached a peak, specifically after the deaths of Tybalt and Mercutio, and shows the characters' attempts to resolve the crisis.