Before you give the contact information of your references, you should

A. They are kept on the shelves in another room.
B. They can be checked out from the library.
C. They can only be read a few hours in the library.
D. They can be accessed to with no aid of the librarian.

A. Civil wars.
B. Severe drought.
C. Bad food shipments.
D. Unfertile fields.