Answer to Question 1
b
Answer to Question 2
One person, when she spends all of her time producing one good or the other, can produce more of either good than the other person. This person has an absolute advantage in producing both goods. However, gains from trade exist when the opportunity costs associated with each good are different for both people. If the costs of producing one good in terms of the forgone production of the other good differ for the two people, then they can gain from trade.