Refer to the Table Comparative and Absolute Advantage I

Refer to the table Comparative and Absolute Advantage I. The table summarizes the amount of tennis rackets and tennis balls that can be produced per unit of labor in Stewarton and Colberton. The opportunity cost of producing tennis rackets in Stewarton is:
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A) one-half ball.
B) one-third ball.
C) two balls.
D) three balls.