Commercial farming includes all of the following except a. the use of pesticides b. shifting cultivation c. hybridized seeds d. the use of tractors and machinery

The correct option is B.
Commercial farming refers to the cultivation of crops that is done on a large scale. Such farming usually makes use of hybridized seeds, machines, pesticides and other chemical that ensure high yields. It is usually difficult to practice shifting cultivation where commercial farming is involved because the land has to be farmed continuously.