Mercutio and Benvolio believe Tybalt is challenging Romeo to a duel in the letter, and they think Romeo will respond the letter accepting the challenge.
In the famous tragic play "Romeo and Juliet," Mercutio is Romeo's friend and Benvolio is Romeo's cousin. Tybalt, on the other hand, is their enemy, which is why they believe his letter contains a challenge.
Romeo and Mercutio attended a party thrown by Lord Capulet, their rival. Now, as a letter from Tybalt is delivered, Mercutio and Benvolio believe it contains a challenge to a duel. They also think Romeo will accept the challenge and either kill or be killed by Tybalt.
With the information above in mind, we can conclude that the answer provided above is correct.
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