The
allowed traders to trave
between Afghanistan and Pakistan.

Pakistan is Afghanistan's largest trading partner, and Afghanistan is Pakistan's fourth-largest export market. ... The 2010 APTTA agreement allowed for Afghan goods to be exported to India via Pakistan territory, but did not permit Indian goods to in turn to be exported to Afghanistan across Pakistani territory.

Explanation:

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work yay..other than that pretty good actually it hot though (≧▽≦)

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.