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.