The correct answer is D.
Stream of conscious narration is an example of experimentation in American modernism. The other techniques were commonly used long before the advent of modernism and would not be examples of experimentation.
It was a rich cream color. His car was bright with nickel. It had triumphant hat-boxes, supper-boxes, and tool-boxes. Terraced with coils of wind-shields the mirrored a dozen suns
Order of Importance sounds right.
