Which best contrasts the old smith in "honest work" with the king's groom in "for want of a horseshoe nail"?

a. the old smith is cheerful and kind, while the king's groom is glum and rude.

b. the old smith is patient and exacting, while the king's groom is rash and careless.

c. the old smith is rather selfish, while the king's groom shows great concern for others.

d. the old smith cares more about money and social standing than the king's groom.