Which of the Following Choices Correctly Illustrates How Changesin Opportunity

Multiple Choice

Which of the following choices correctly illustrates how changesin opportunity costs affect supply?

A) A farmer produces corn and wheat.The price of wheat rises; so he shifts his resources towards wheat and the supply of
Wheat rises.
B) A fisherman fishes for lobsters and oysters.The price of lobsters rises; so he decides to spend more of his time fishing for
Oysters because he can make the same amount of money with
Fewer lobsters.
C) A textbook for economics becomes cheaper; so more students opt to buy that particular textbook.
D) Milk and cereal are complementary goods; so when the price of cereal falls, the quantity supplied of milk rises.