SAT Question a06c434d: Words In Context answer and explanation

English - Words In Context - Fill In Blank Single Word
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The work of Kiowa painter T.C. Cannon derives its power in part from the tension among his ______ influences: classic European portraiture, with its realistic treatment of faces; the American pop art movement, with its vivid colors; and flatstyle, the intertribal painting style that rejects the effect of depth typically achieved through shading and perspective.
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Difficulty:Hard
Which choice completes the text with the most logical and precise word or phrase?