Romeo is unhappy, and Mercutio is upbeat.
Romeo is upbeat, and Mercutio is unhappy.
Romeo is nervous, and Mercutio is brave.
Romeo is brave, and Mercutio is nervous
The correct option is A. Romeo is unhappy, and Mercutio is upbeat. Romeo claims that he is "not for this ambling", "heavy", and "a soul of lead". This shows that Romeo is unhappy.