What can be found in the category of "Reader’s Guide to Periodical Literature"()

A. compete for customers.
B. reduce the size of their staff’.
C. provide services for distant clients.
D. expand their operations at a lower cost.

A. Our favorite color is inborn.
B. We choose our favorite color as we grow up.
C. With the instruction of our parents we select them.
D. We get them by chance.