The interval between any note and its nearest neighbor with the same letter name is called
a. an octave
b. a unison
c. a third
d. a fifth

(A) an octave

Explanation:

an octave is a series of eight notes occupying the interval between (and including) two notes, one having twice or half the frequency of vibration of the other.

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.