Q:Read the following conversation and answer the question. M: Good morning, Miss. I'd like to speak to the manager. W: I am the manager, Sir. How can I help you? M: Oh, really? It's this radio. It doesn't work. W: Mm... did you buy it here? M: What do you mean? Of course I bought it here. Look, you switch it on and nothing happens. W: Could I see your receipt? M: Receipt? I haven't got one. W: Oh, you should have got a receipt when you bought it. M: I perhaps did. I must have thrown it away. W: Ah, well, have you got any other proof of purchase, the guarantee, for example? M: No. It must have been in the box. I threw that away, too. W: Oh, dear. You really ought to have kept it. We need to know the exact date of purchase. M: What? I only bought it yesterday! That young man over there served me. Oh, I paid by cheque. I've got the cheque stub. W: That's all right then. Did you check the radio before you left the shop? M: Check it? No, it was in the box. I hoped it would work. It wasn't a cheap radio. It's a good make. W: You should have checked it. M: Come on! Do not tell me what I should have done, and do something! Either give me my money back or give me another raido. W: There's no need to get aggressive, Sir. Let me look at it... mm... you see this little switch on the back? M: Yes? W: It's on "main", and it should be on "battery". You really should have read the instructions. M: Oh! Question: When did the man buy the radio? - Last week. - The day before yesterday. - Yesterday.
A:
Yesterday.