Please provide the explanation of the answer

9.) Suppose we have Fred and Barney. Each wants one unit of each good beer and pretzels. Below is their underlying productivity for each good in terms of time. The price is one unit of beer equals one unit of pretzels. Which of the following is true? Beer 25 Minutes Beer 20 Minutes Pretzels 35 Minutes Pretzels 15 Minutes A. Barney has a comparative advantage in both beer and pretzels B. Barney gains nothing from trade with Fred C. Fred's gain is 60 minutes, while Barney's gain is 35 minutes D. Fred's gain is 10 minutes, while Barney's loss is 5 minutes E. Fred imports pretzels and exports beer