For several weeks Mrs Edwards hoped, like many of her friends, to be the luck customer. Unlike her friends, she never gave up hope. The cupboards in her kitchen were full of things which she did not need. In vain her husband tried to dissuade her. She dreamed of the day when the manager of the supermarket would approach her and say: "Madam, this is your lucky day. Everything in your basket is free".
On Friday morning, after she finished her shopping and took it to her car, she found that she had forgotten to buy any tea. She dashed back to the supermarket, and went towards the cash-desk. As she said so, she saw the manager of the supermarket approach her, "Madam",
he said, holding out his hand,"I want to congratulate you" You are our lucky customer" and everything you have in your basket is free."
The housewives learnt about the offer of free goods _______.

A. on the radio
B. from the manager
C. at the supermarket
D. from their friends