Functionalists argue that religion serves the function of social control and support for the government. religion maintain social control by conferring on the norms and laws of a society.

By conferring the supernatural legitimacy on the norms and laws you strengthen the social control as now the laws and norms are in connection to some force that is larger than man. Also according to Emile Dukrheim the religion is the thing that promotes social solidarity while other thinkers also propose that religion contributes to the social cohesion.

answer:

d. because dr. laguardia selected a widely used measure, his study generalizes to has strong external validity. external validity has limited external validity. other applications of this measure.

the widely used measure that he applied to his experiment was the benton facial recognition test. it employed on to football players and as result, only players who suffered brain concussions did not pas this test. and although it has an external validity, it is limited because it isn't general to apply to other population.