The underlined word "perturb" in the first paragraph most probably means ______.

A．The borderline between the common good and personal privacy is no longer elusive.
B．With the development of information technology even highly skilled and professional functions may become obsolete.
C．People can never catch up with the rate of obsolescence of knowledge.
D．People who are given access to information are literate.

A．An Introduction to Desktop Video Conferencing.
B．Modern Office and Video Conferencing.
C．A New Solution for Office Work.
D．Face to Face with Your Partners.