When I did a quadratic regression, and derived the formula, I got:
so, once you put in 3, you get roughly
So, I'd say it's D.
But to have a more clear answer, if you take the slope between points (3,45) and (2.8,39.2); you get 29.
Then with points (3.1,48.05) and (3,45); you get 30.5
Obviously then since the function is continuous, it must be in between 29 and 30.5, which gives option D.
hope this helps.