Sherwin will most likely sleep for 1 hour if he consumes 9 cups of coffee. 
To answer this, you need to focus on the line of “best fit”- the purple line. 
The line equation is y= -x + 10. This is because the y intercept is (0,10) and the slope is -1/1. With this information, it can be concluded that the coordinate (9,1) would be correct. 
Therefore, the answer is A. I hope this helps you! :))