A play with a unhappy ending is called a Tragedy.
Unhappy ending refers to the ending part of the play, story or the Drama which is sad. For example: the drama of the Shakespeare has an unhappy ending because both the main characters of the stories i.e. Romeo and Juliet dies at the end.
Those plays or the story which has the unhappy ending refers to the Tragedy. It causes the sadness in the audience. Trajectory happens when main character of the story goes with lot of sufferings or dies.
Thus the correct option is Tragedy.
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