Explanation: Someone who is stubborn and bitter refuses to budge in their opinions, once they've decided something they won't be taking criticism or changing their mind. They probably give off an unapproachable vibe
"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.
B: a former slave. because of frederick being a slave in the 1800’s he isn’t ancient. C doesn’t make sense. therefor B is the answer