John's took his appointment book with him to a checkup but couldn't find it anywhere. He looked and he looked but he didn't know where it was.  It wasn't until he bought a new one, went home, took a shower that he found it.  Where was it?
Choose the most suitable option to answer the above question.
Options：

A. office supply store

B. wallet

C. doctor's office

D. handbag

E. pocket



E