Sam and his dad were trying to combat the fire ants in the backyard. they tried several brands of fire ant "killing" chemicals but none worked. finally, sam's dad decided to try an old-time idea: pouring grits on the mounds. what question could be used to guide sam's study of fire ants?

The most obvious and best question could be used is - do grits more effective in killing the fire ants than chemical substances.

Explanation:

In this incident or case, there are two different variables are used that are several fire ants killing chemicals and the grit. Grit worked better in killing in comparison to the other chemicals.

It suggests that there is more effectiveness in the grits than these commercial chemicals. On the basis of the comparison of both variables, the question could be used if grits more effectively killed fire ants than chemicals.