While exploring the Americas, Hernando de Soto discovered
the Mississippi River.
B.
the isthmus of Panama.
C.
the St. Lawrence River valley.
D.
the South American continent.

The right choice is:

A. The Mississippi River.

Explanation:

Hernando de Soto was a Spanish conquistador and adventurer who arrived in the New World to make his fortune. He made a big business with the slave trade in Central America, supported the Pizarro´s expedition to Peru. In 1538, he went to North America heading troops to attempt to conquer Florida and explore. In 1541, De Soto made it to the bank of the Mississippi River, the first European to see it.

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.