What must a technician do to assure animals are receiving water

What must a technician do to assure animals are receiving water and libitum?

A.Add medication to the water twice per day

B.Observe the animals and equipment to assure they are getting enough water at all times

C.Provide water by bowl or bottle

D.Inject fluid subcutaniously so the animal doesn't become dehydrated

正确答案是B