F: Today, we've invited a former student at our school to speak with us, so pay attention children. Mister Lee is a successful inventor of a popular smartphone app. ,M: Thanks for having me, Miss Smith.
(A) F: You are welcome. Although you are not the inventor of mobile phone App, it is my honor to have you as the inventor. (B) F: You're welcome. It's my pleasure to have you as an inventor. Tell us more about you, Mr. Lee. (C) F: You're welcome. It's my pleasure to have you as a producer. Thank you very much for coming to our company. (D) F: Excuse me, could you repeat the question?
B