Use the Following Scenario to Answer the Following Questions

Use the following scenario to answer the following questions:
Natasha can produce either 5,000 pounds of cheese or 20 houses per year.Jameson can produce either 5,000 pounds of cheese or 10 houses per year.
-Natasha's opportunity cost of producing one pound of cheese is ________ house(s) .

A) 1/250 of a
B) 1/20 of a
C) 20
D) 250
E) 500