The table shows the production possibilities for two countries, Colombia and Bolivia, which produce natural gas and soybeans. Ceteris paribus, based on this information and assuming constant opportunity costs for simplicity, has a comparative advantage in producing natural gas and has a comparative advantage in producing soybeans. 

a. Colombia; Bolivia

b. Bolivia; Bolivia

c. Colombia; Colombia 

d. Bolivia; Colombia

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Country Production per Month Colombia 900 million units of natural gas or 300 million units of soybeans Bolivia 400 million units of natural gas or 200 million units of soybeans