I don’t know if I should pick tornados or all above... someone help pls

all of the above

Explanation:

lightning, hail, tornados, etc are all associated with thunderstorms.

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.

you should try adrenaline. it kicks in in situations like this.