During the Tang period, trade improved because of the reopening of the Silk Road and the opening of...
O gold mines.
O larger caravans.
O new seaports.
O the Porcelain Road.

Two gymnastics teams are intense rivals. the first team has started recruiting new gymnasts from different cities and even foreign countries in an effort to build a stronger team. after learning this, the second team begins its own recruitment campaign to find even better gymnasts. over a period of months, each team recruits dozens of players, each time trying to find a better recruit than its rival's most recent addition. which idea from the cold war is most similar to this scenario?