Which of the following can be a best title for the passage

A．advertising in the newspapers
B．reminding people of their products
C．employing attractive salesgirls to distribute samples
D．organizing competitions with prizes for the winners

A．Some people never have any doubts about what advertisements tell them.
B．Competition exists between different manufactures of the same products.
C．The customer usually demands more than the manufacturer can supply.
D．The manufacturer wants to persuade customers to buy brand of goods.