The correct options are
C Commercial crops are grown in bulk quantities in large farms.
D Commercial crop is grown to sell for profit.
Cultivating crops in large quantities primarily for selling in the market is known as commercial farming. In this type of farming crops are grown in bulk quantities in large farms. Crops like tobacco, jute, cotton etc. are all commercial crops. Farming done on the basis of need is called subsistence farming. Commercial crops can be grown in other types of farming too. For instance, tea, which is a commercial crop is grown on a plantation and can be grown in subsistence farming as well.