Jorah is a sword collector. he often travels to conventions and fairs to buy rare swords for his collection, which can be expensive. if jorah
knows that a vendor ata convention in oldtown will be selling a rare sword he wants, jorah will travel to the convention if
a. the marginal benefit of buying the rare sword exceeds the marginal cost of traveling to the convention
b. the marginal cost of traveling to the convention exceeds the marginal cost of buying a rare sword.
c. the marginal cost of buying the rare sword exceeds the marginal benefit of traveling to the convention
d. the marginal cost of traveling to the convention exceeds the marginal benefit of buying the rare sword.