In this task, you will be shown a conversation and a question. You need to answer the question and choose the correct option based on the conversation. "W" and "M" in the conversations stand for "woman" and "man".
Q: M: Isn't the Changjiang River twenty-five thousand kilometres long? W: Oh, no, it's not as long as that. It's about a quarter the length you said., Question: How long is the Changjiang River? (A) About 6000 km. (B) About 5000 km. (C) About 4000 km.
A:
(A) About 6000 km.