单项选择题A.Toothpaste, shampoo and washing powder.B.Different brands of the same product.C.Performance, price, value for money, quality & reliability.D.Freedom of choice for the producer.
A.Toothpaste, shampoo and washing powder.
B.Different brands of the same product.
C.Performance, price, value for money, quality & reliability.
D.Freedom of choice for the producer.