A、His sales report. B、His traveling schedule. C、His book. D、His presentation. C问题问的是“女士想和史密斯先生讨论什么”。根据对话内容可知,女士说想和史密斯先生讨论他书的出版问题

M：Hello, B&B Company. Jane’s speaking. How can I help you?
W：Hello. May I speak to Mr. John Smith, please?
M：I’ m afraid he’ s not available. He is in a meeting. Can I take a message?
W：Yes, please. My name is Jean Cousy.
M：OK. And how can Mr. Smith contact you?
W：My phone number is 2034 7722.
M：All right, Miss Cousy. What is the message about, may I ask?
W：I want to discuss the publication of his book with him.
M：OK. I will pass your message to Mr. Smith.
W：Thank you.
18. Why is Mr. Smith not available now?
19. What does the woman want to discuss with Mr. Smith?