Which belongs in the summary because it is an important event caused by the main problem??

problem=the miller needs a job and worries about other peoples opinion of him

A: the miller continues to treat his son very poorly

B: the miller and his son climb up on the donkey with him

C: a group of mother maneuver their strollers around the travelers

D: the millers donkey pushes ahead despite the great burden on its back

please help