Which of the following is NOT true about specialization or division of labour?

• A.Specialization and exchange go hand in hand
• B.Specialization implies that each person produces a surplus of one or a few items (e.g commodities) n which he is specialized
• C.Division of labour needs not take account of the extent of the market
• D.Division of labour results in increased productivity
• E.Division of labour involves the danger of unemployment