General Wesley Clark recently discovered a hole in his personal security—his cell phone. A resourceful blogger, hoping to call attention to the black market in phone records, made his privacy rights experiment on the general in January. For $ 89.95, he purchased, no questions asked, the records of 100 cell-phone calls that Clark had made. (He revealed the trick to Clark soon after. ) "It’s like someone taking your wallet or knowing who paid you money", Clark says. "It’s no great discovery, but it just doesn’t feel right." Since then, Clark has become a vocal supporter of the movement to outlaw the sale of cell-phone records to third parties. The U. S.’s embrace of mobile phones—about 65% of the population are subscribers—has far outpaced efforts to keep what we do with them private. That has cleared the way for a cottage industry devoted to exploiting phone numbers, calling records and even the locations of unsuspecting subscribers for profit. A second business segment is developing applications like anonymous traffic monitoring and employee tracking. Most mobile phones are powerful tracking devices, with global-positioning systems (GPS) inside. Companies like Xora combine GPS data with information about users to create practical applications. One similar technology allows rental-car companies to track their cars with GPS. California imposed restrictions on the practice last year after a company fined a customer $ 3,000 for crossing into Nevada, violating the rental contract. Other applications have not yet been challenged. For about $ 26 a month per employee, a boss can set up a "geofence" to track how workers use company-issued cell phones or even if they go home early. About 1,000 employers use the service, developed by Xora with Sprint-Nextel. The companies selling those services insist that they care about privacy. AirSage, for example, gets data from wireless carriers to monitor drivers’cell-phone signals and map them over road grids. That lets it see exactly where gridlock is forming and quickly alert drivers to delays and alternative routes. The data it gets from wireless carrier companies are aggregated from many users and scrambled, so no one can track an individual phone. "No official can use the data to give someone a speeding ticket", says Cy Smith, CEO of AirSage. Privacy advocates say that even with those safeguards, consumers should have a choice about how their information is used. Some responsibility, of course, rests with the individual. Since his data were revealed, Clark took his mobile number off his business cards. Wireless carriers also recommend that customers avoid giving out their mobile numbers online. But Clark insists that the law should change to protect our privacy, no matter how much technology allows us to connect. "One thing we value in this country", he says, "is the freedom to be left alone. \ The blogger publicized General Clark’s phone record______.

A. to earn money from the internet
B. to blackmail the general for money
C. to play a trick on the general
D. to warn people of the information security