Which sentence best explains why politicians continually need to reevaluate domestic policy?

a) americans are unable to agree on any single solution.

b) a solution might become obsolete over time.

c) politicians come from different regions and backgrounds.

d) many americans choose not to vote in most elections.

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.

answer; incorporation;