单项选择题

A.SELECTproduct_id,expriy_date*2FROMproducts
B.SELECTproduct_id,(unit_price*0.15/(4.75+552.25))FROMproducts
C.SELECTproduct_id,unit_price,unit_price+surchargeFROMproducts
D.SELECTproduct_id,(expriy_date–delivery_date)*2FROMproducts
E.SELECTproduct_id,unit_price,5Discount,unit_price+surcharge-discountFROMproducts
F.SELECTproduct_id,unit_price5Discount,unit_price+surcharge-discountFROMproducts