Use the Following Scenario to Answer the Next Eight Questions

Use the following scenario to answer the next eight questions:
Karl and Pete produce cars and trucks. Karl can produce 10 cars per hour or 5 trucks per hour. Pete can produce 12 cars per hour or 4 trucks per hour.
-Based on the scenario,Karl's opportunity cost of one truck is:

A) 4 cars.
B) 1 1/2 cars.
C) 2 cars.
D) 3 cars.
E) 8 cars.