Suppose there is strong scientific evidence showing that the execution of criminals deters serious criminal behavior better than lesser punishments such as imprisonment. this data would suggest that the deterrence argument is:

I Believe the answer is: Strong

An argument could be considered as storng if the data at hand show strong correlation between the argument and the fact on field.
In this case, the  strong correlation between execution of criminals  and the decrease in number of  serious criminal behavior would support the argument that favor death penalty.

Ibelieve b) recall election