Some of Your Site's Users Have Called to Complain That

Some of your site's users have called to complain that they do not understand the policy for shipping charges. Initially, the Web team created a pop-up window that appears at the point of purchase, designed to explain the shipping charge policy. Why did some of these users fail to get this message?

A) Because newer browsers have automatic pop-up blockers
B) Because firewalls blocked the server-side scripts that create pop-ups
C) Because antivirus software blocked the pop-ups
D) Because firewalls blocked the client-side scripts that create pop-ups