What does the woman want to listen to

A．They do not want to use the reference materials.
B．They have been keeping the librarian busy.
C．They have part-time jobs at the library.

A．it was a necessary step in the process of industrialization
B．they depended on electricity available only to the market economy
C．it was troublesome to produce such goods in the home
D．the marketplace was more efficient with respect to these processes