How did the nineteenth-century defenders of photography stress the photography

A．He wants to provide an example of artists who, like serious contemporary photographers, disavowed traditionally accepted aims of modem art.
B．Be wants to set forth an analogy between the Abstract Expressionist painters and classical Modernist painters.
C．He wants to provide a contrast to Pop artist and others.
D．He wants to provide an explanation of why serious photography, like other contemporary visual forms, is not an should not pretend to be an art.

A．defining the Modernist attitude toward art
B．explaining how photography emerged as a fine art
C．explaining the attitude of serious contemporary photographers toward photography as art and placing those attitudes in their historical context
D．defining the various approaches that serious contemporary photographers take toward their art and assessing the value of each of those approaches