In an eight-hour day, Andy can produce either 24 loaves of bread or 8 pounds of butter. In an eight-hour day, John can produce either 8 loaves of bread or 8 pounds of butter. The opportunity cost of producing 1 pound of butter is:_________.
a. 1/3 hour for Andy and 1 hour for John.
b. 1 hour for Andy and 1 hour for John.
c. 3 loaves of bread for Andy and 1 loaf of bread for John.
d. 1/3 loaves of bread for Andy and 1 loaf of bread for John.
e. none of the above