阅读下列段文，从每题所给的四个选项（A、B、C和D）中，选出最佳选项，并在答题卡上将项涂黑。
A
Targeting teens
Using the Web makes teens a target. Posting too much personal information for those millions of cyber eyes to see can cause some big problems and can even invite a threat to your life.
As Mary learned, not everyone on the Internet is who he or she says they are. Adults will sometimes pose as other teens, posting fake photos and nice messages to gain trust. They use their fake identity to access the personal information of others, such as home address, phone number, or school name.
