Two sides of a four-sided figure have negative slopes. Which are the endpoints of the sides of this figure?
A. (–4, –4), (–4, –1), (–1, –4), (–1, –1)
B. (–2, –4), (–1, –1), (1, –1), (2, –4)
C. (1, 1), (2, 4), (5, 4), (4, 1)
D. (1, 4), (2, 1), (5, 1), (4, 4)