'Punt' can mean 'a long, narrow flat-bottomed boat, square at both ends and propelled with a long pole, used on inland waters chiefly for recreation'. So, in only one sentence I uses the word correctly. Sentences II and III are incorrect as the given word fails to convey the required meaning. 'Dug' and 'prevent' can fit in the place of the given word in these sentences. B is the right answer.