I think it's B, but I'm not 100% positive.
Tigris and Euphrates river, in the midst of a vast desert, the peoples of Mesopotamia railed upon these rivers to provide drinking water, agricultural irrigation, and major transportation routes.
No, it is generally false that the <span>ancient Chinese were eager to share the art of silk production with other cultures, since in fact at first they wanted to be relatively "closed off" from the outside world. </span>
