A是什么意思啊

问题如下：

Suppose Mexico exports vegetables to Brazil and imports flashlights used for mining from Brazil. The output per worker per day in each country is as follows:

Which country has a comparative advantage in the production of vegetables and what is the most relevant opportunity cost?

选项：

Brazil: 2 vegetables per flashlight.

Mexico: 1.5 vegetables per flashlight.

Mexico: 1/3 flashlight per vegetable.

解释：

C is correct.

While Brazil has an absolute advantage in the production of both flashlights and vegetables, Mexico has a comparative advantage in the production of vegetables. The opportunity cost of vegetables in Mexico is ⅓ per flashlight, while the opportunity cost of vegetables in Brazil is ½ per flashlight.

考点：比较优势

墨西哥出口蔬菜，理论上该国生产蔬菜有优势，成本较低。那我们来具体算一下是不是这样，
M: 20F=60V, 1V=1/3F
B：40F=80V,1V=0.5F
果然M国生产蔬菜的成本较低，选C