Clerk: Would you sign the register please, Sir
Mr. Woods: Sure. （）, does my room have a private bath
Clerk: Certainly. Every room in this hotel has a private bath.

A. they are innocuous agencies
B. they are the causative agents of most human cancer
C. they seem to be infections to many people
D. they are generally thought to be relevant to most cancer in man

A.traveled 
B.lived 
C.went 
D.arrived