Answer: D. He is delighted to have his lively friend back.
Explanation: In Act II, Scene IV of "Romeo and Juliet" by William Shakespeare, what Mercutio feels about Romeo's witty insults is<u><em> he is delighted to have his lively friend back</em></u>. Romeo meets Mercutio and Benvolio. Mercutio and Romeo are joking. Romeo's witty insults make Mercutio happy to have his friend back. He says that now he is sociable again, and acts the way he is instead of groaning for love.
