Since we are not given the scatter plot, it would be hard to figure what is the correct association. My only option would be to discuss each of the option as much I could. Linear positive association would be depicted by a scatter plot with data that almost forms a straight line and sloping to the right upward. As the x increases, the y increases as well. Linear negative association would be the opposite of the linear positive. The plot would sloping upward to the left. As the x increases, the value of y would decrease. Nonlinear positive association would be almost the same as the linear positive however the data do not form a line. It may be form a curve. Nonlinear negative would be also almost the same as the linear negative only that the data do not form a line.
