Could you help me answer this question? and explain why the answer is correct and how the others incorrect.

18. Consider the following scatterplot of the results from a clinical trial for the effectiveness of three different painkillers. On the y-axis we have patient self-reported pain score and on the x-axis we have the type of drug patients have been taking 16- pain vs. drug 14- .. 12- 10- . . pain 4- 2- A C drug We may conclude that (select all that apply): A) there is positive association between the self-reported pain score and the type of drug. 3) there is negative association between the self-reported pain score and the type of drug. C) there is association between the self-reported pain score and the type of drug