What does the author mean by saying "gaining momentum on the Internet"

A．how to avoid double-click on infected email attachments.
B．how emails both carry and spread viruses and worms.
C．what new viruses can automatically launch themselves.
D．what new viruses are capable of with an double-click on.

A．of the teacher to make clear to the students the relevance of the activity and the target.
B．of the teacher to see the relevance of what they're doing and their own personal goals.
C．of the students to understand the activity cognitively before they tackle something.
D．of the students to identify clearly their targets before they do anything in class.