The important thing in this sentence is weight. Weight is measured in grams and kilograms. Where 1000 grams is equivalent to 1 kilogram. Therefore we can eliminate B 2 litres , D 200 mm. The other options all have these measures of weight. Now a caravan weighs around 2000 kilogram which can be written as 2000 kg. A bag of flour cannot weigh 2000 kg cause you cannot pick up a caravan. Now 2 grams is nothing, its not even carrying a feather. Therefore, the only option left is 2 kg which must be the weight. A 2 g B 2 litres C 2000 kg D 200 mm. Hence, the answer is E 2kg. Other items that weigh that much may be 2 bottles of water or a large bag of pasta.