Answer:
the answer is a.encyclopedia
"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.
The sentence showing correct punctuation is Sentence 3. Since "girl" is a singular noun, the possessive form should be "girl's".
Sentences 1, 2 and 3 show incorrect representation of a singular possessive noun. The appropriate to use on these sentence is "girl's".