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D) The Assyrian army was so strong because of their use of technology, specifically their use of iron.

Explanation:

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The answer is D.

Explanation:

The Assyrians were successful on the battlefield for a number of reasons. They were the first to utilize iron weapons, which gave them an advantage over armies using bronze. ... They also had a corps of engineers that helped the army to build bridges, battering rams, and towers.

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.