Two sides of a four-sided figure have negative slopes. Which are the endpoints of the sides of this figure?

Find the slope of each side by connecting the points in the order listed and then connecting the last point back to the first. In choice D, the sides from (1, 4) to (2, 1) and from (5, 1) to (4, 4) each have negative slope: their y-values increase as their x-values decrease, or decrease as their x-values increase. The other two sides are horizontal, so choice D has exactly two sides with negative slopes.

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