Write a multi-choice question for the following article, with the given choices and answer: Article: I'm Lucy. I'm 14 years old. I come to China this year. Now I'm in Beijing International Middle School. I like animals . I think they're my good friends. When I go to school this morning, I meet a man with a cage . Five birds are in it . " How do you get these birds?" I ask . " I give them some food . When they come to eat it , I get them ." The man says . " They are too poor . Why do you get them ?" I ask the man . " It's very interesting !" The man says . " I need to do something ." I think . I want to help the birds . " Can I buy them ?" I ask . " Well ," he says , "Give me 50 yuan and your jacket ." I don't want to give my jacket to him because I like it very much . But for these birds I do it . The man gives me the cage. Then I let the birds fly out of the cage . I am happy to do that . Options: A $50 B $50 and the price of a jacket. C Y=50 D Y=50 and the price of a jacket. Answer: D Y=50 and the price of a jacket. Question:
The answer to this question is:
How much are the birds? _ .