Farce is a type of comedy that is known for its use of exaggerated and ridiculous situations, often involving mistaken identities, misunderstandings, and slapstick humor. It relies heavily on satire, which is the use of humor, irony, or ridicule to expose and criticize human foolishness or vices. In a farce, the humor is often derived from the absurdity of the situations and the exaggerated actions and reactions of the characters. Therefore, the correct answer is "a comedy characterized by broad satire."