What is one way Mrs. VanDann could have handled the time in the Secret Annex better?

During their time in ‘Secret Annex’, the Franks and the van Daans had very limited contact with the outside world. Their only means were the hidden radio in the private office and their Dutch friends who brought news of the outside world. Broadcasts from England could be heard on the radio and the Franks and the-van Daans heard the radio every evening after 7.30 pm, when the office was closed for the day

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.