If 'Train' is called 'Bus'; 'Bus' is called 'Tractor'; 'Tractor' is called 'Car'; 'Car' is called 'Scooter'; 'Scooter' is called' Bicycle'; 'Bicycle' is called 'Rickshaw', then which is used to plough a field?

• A.  Train     
• B.  Bus
• C.  Tractor     
• D.  Car