What is the author's MAIN reason for including information about qualities that make people feel insecure or vulnerable?
A
to argue that confident people avoid worrying about these things
B
to explore which of these things you can begin changing first
C
to suggest it is important to get these things out in the open
D
to demonstrate most people worry about the same things

photography had emerged as an elite art pursued by a few creative individuals for a few wealthy patrons. but now, said bauldelaire, it was succumbing to "the great industrial madness of our times." it was becoming a mass production industry that catered to middle-class tastes, including a taste for gadgetry. the stereoscope, the first 3d imaging system, had turned looking at photographs into parlor entertainment. a "thousand hungry eyes were bending over the peepholes of the stereoscope as though they were the attic-windows of the infinite.