Corn and Hemp are not cash crops for the plantations. Cash crops are those which are produced for commercial purposes rather than food grains. So the correct options are B and F.
What are the differences between cash crops and food crops?
Food crops are grown for the purpose of being eaten by humans and animals while the primary purpose of cash crops is to earn money by selling them.
Some examples of food crops are fruits, vegetables, grains, and tubers like potato, onion, tomato, wheat is the most grown crop in the world. Cash crops are cotton, sugarcane, indigo, and tobacco.
Therefore the correct option is B and F.
Learn more about Cash and food crops here:
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