A、He was shocked. B、He was happy. C、He was sad. D、He was angry. A

A: Hello, this is Tom Lock speaking. I’d like to see if my TV has been fixed.
B: Let me see, Mr. Lock. What brand is yours?
A: My TV is Star, 25 inches.
B: Hold on please, I’ll check it for you.... Hello, Mr. Lock, it is ready. When would you like to get it back?
A: Is tomorrow afternoon OK? How late are you open?
B: Tomorrow afternoon is fine. We are open until 6:00 p.m.
A: By the way, how much do I owe you?
B: Let me see.., it’s 1,200 yuan.
A: What? Are you sure? My TV came in yesterday with only a small problem. A switch didn’t work properly.
B: I can’t believe it. The note on the TV says tube replaced... Oh, I’m terribly sorry, Mr Lock. This is somebody else’s.... Here is yours. Ah, right. The note says "replacement of a switch, 50 yuan—Tom Lock". I’m awfully sorry for the mistake.
A: Well, that’s fine. It’s an easy mistake.