The correct option is B The father's jovial spirits were not ultimately dampened when his son did not assume the errand.
Option A is the correct answer. The poem hints at a playful relationship between a father and a son,who enjoy defying and one-upping each other. The word "still" here indicates the continual state of amusement the father had over his son's defiance. It is almost like he was expecting his son not to obey him, and he was not unhappy with the result. The statements of options D and E suggest that the father was displeased with the boy's reaction, which in contrast to the statement in the poem. Options B and C suggest this relationship to be the same indefinitely. This relationship, masking a game, we have to assume that someone is going to lose. Options B,C,D and E are incorrect in this context.