The correct option is
B Hard working bullocks
The cattle are mainly classified into milch and draught. The milch are the variety which has greater milk production. While draughts are involved in hard labour on agricultural fields. They are involved in the activity like irrigation, carting etc. The bullocks of the drought breeds are excellent drought animals. The main drought breeds in India are Nagori, Bachaur, Kathiawari, Malvi. Therefore, the correct answer is option B.