Suppose That a Typical German Factory Can Produce 20 Cameras

Suppose that a typical German factory can produce 20 cameras or 1 computer in an hour, and that a typical American factory can produce 10 cameras or 1 computer in an hour. The opportunity cost of 20 cameras in terms of computers in Germany is

A) 10 computers per camera.
B) 2 computers per camera.
C) 1 computer per camera.
D) 1/20 of a computer per camera.