Why does Carr note that readers should be "skeptical of his skepticism"?
A. Carr argues that today's readers must be much more cognizant of
writers' credentials than any previous generation.
B. Carr believes that skepticism is one countermeasure to the fast
pace of online reading.
C. Carr acknowledges that today's readers are better off than readers
of the past thanks to technological shifts in the last decade.
D. Carr acknowledges that previous technological shifts have not had
the negative effects he's imagining for the Internet.