What is the silk road? (for china)

1.a series of trade and routes only used to trade silk

2.a series of trade and routes that connected east and west asia

3.a series of trade and routes that connected east and west africa
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Out of the options provided, Option 2 is the best response: A series of trade and routes that connected East and West Asia.

Explanation:

The Silk Road primarily refers to the land routes that traversed East Asia into Southeast Asia and South Asia. Some areas of note along the Silk Road were Persia, the Arabian Peninsula, East Africa, and the kingdoms of southern Europe.  The influences of the interchange that resulted along this route were vast; products like silk from China and spices from India were brought to Europe along these land routes and the maritime routes that mirrored them. The Silk Road was influential in cultural, religious, and technological exchanges for a long time, from the second century BCE to the eighteenth century.

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.