Answer :
In Chapter 4 of "The Call of the Wild," Francois and Perrault were both proud and sad because of Buck's exceptional racing abilities. The Option A
What caused their reaction
In this chapter, Buck's remarkable racing abilities become evident as he outpaces and outperforms the other sled dogs. Francois and Perrault take immense pride in Buck's physical prowess and endurance, which make him an invaluable member of their team.
They marvel at his strength and determination which enable him to pull heavy loads with ease and cover long distances.
However, this pride is tinged with sadness because they also recognize that Buck's wild instincts are growing stronger, leading him towards a life in the wilderness, away from the familiarity of the sled team and the humans he has come to know.
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