【单选题】The simple act of surrendering a telephone number to a store clerk may not seem harmful -- so much so that many consumers do it with no questions asked. Yet that one action can set in motion a cascade...
A.
Many customers didn’t keep their privacy confidential.
B.
It is harmful to give a store clerk a telephone number .
C.
Careless disposal of personal information can be harmful.
D.
Customers should inquire its use when giving telephone numbers to others.