Answer:
3. India
Step-by-step explanation:
Remember that comparative advantage, an economic term, refers to when a country is able to produce a good or service for a opportunity cost than other countries. This means this country or individual sacrifices less to produce it's product. In this way they can sell goods and services at a lower price than competitors, having stronger sales margins.
In this case the opportunity cost of producing cups means how many plates could have been done when doing one cup.
India: 1 cup - 0.666 plates
France: 1 cup - 1.25 plates
India: 1 cup - 1 plate
Japan: 1 cup - 1.5 plates
We can see that the lowest opportunity cost is the one of India, this means it sacrifices less in the production of cups making it have comparative advantage over the other countries.