单选题 Speaker A: Are you enjoying the book I lent you, Bob?
Speaker B: Not really. It's well written, I'm sure, but it just isn't my cup of tea.
Speaker A: Oh! Gee. I liked it a lot. I was sure you would too.
Speaker B: Well,______, as they say.
A. each to his own B. to his own each C. his own to each D. to each his own