B) decreasing; the slope of the line between D and E is negative. you can rule A out because the graph isn't constant. You can rule C out because the slope between DandE is going downward (negative slope) and you can rule D out because the line between DandE is a straight line so it's identified and again its moving downward so it's negative
Constant: When the graph has a straight line, because the constant of proportionality wouldn't change. Decreasing: Going from up to down, or otherwise known as a negative correlation. Increasing: Going from down to up. Values increase.
B would be the answer since from D to E, it's decreasing, and becoming negative.