Diane Arbus was completely occupied with subject matter and ______________ the niceties of conventional art form.

The sentence contrasts Diane Arbus’s focus on subject matter with her attitude toward the formal conventions of art. “Rejected” completes that contrast: she was occupied with what she photographed rather than with the niceties of conventional art form. “Embraced” and “enhanced” would suggest she valued or improved those conventions, which does not fit the sentence.

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