<span>D. The stranger smiled on, his downward-slanting eyes like empty pits. (161)</span>
Comedic Relief
Capulet calls for a sword, but Lady Capulet's lines 'offer' him a crutch instead. This is used to show how old and incapable Capulet would be in a street brawl with much younger and stronger fighters. Capulet refers to Montague 'flourishing his blade in spite' of him, which shows that Montague is not taking part in the actual fight either, just waving his sword around. This shows that the head of both houses are not actually effectual within the fight, but encourage its continuation regardless.
"exuberance" means enthusiasm or showing a lot of energy. if someone holds back a cry of pain, that doesn't really make them seem energetic or excited. from that alone, you can infer that "stoicism" is your answer, but that word relates to a pointed lack of emotion, like when someone doesn't want to lose face or show that they're in pain.