Suppose an American Worker Can Make 20 Pairs of Shoes

Suppose an American worker can make 20 pairs of shoes or grow 100 apples per day.On the other hand,a Canadian worker can produce 10 pairs of shoes or grow 20 apples per day.Which of the following statements is true?

A) The United States has a comparative advantage in the production of shoes.
B) Canada has a comparative advantage in the production of shoes.
C) Comparative advantage doesn't exist in this scenario.
D) Both countries have a comparative advantage in the production of shoes.