Answer:
by refusing to treat Romeo’s romance seriously
Step-by-step explanation:
According to the excerpt from Act II, scene iv of Romeo and Juliet, there is a dialogue between Mercutio and Romeo about Romeo’s romance. Mercutio makes jest of Romeo and his "fair lady*, comparing her to harlots, dowdies and gypsies.
Therefore, Mercutio offers comic relief in this excerpt by refusing to treat Romeo’s romance seriously.