According to the passage, Germany is most likely to achieve its leading position in Europe through ______.

A．It contributed to reducing the threat of direct confrontation between the East and the West.
B．It helps to alleviate some problems existing in the former East Germany.
C．It was accomplished in 1990.
D．It brought together all the groups of people who speak German.

A．Thailand is Asia's biggest producer of opium.
B．Most of the marijuana distributed to the U.S. comes from Columbia.
C．Coca leaf is mainly grown in South America.
D．Drugs are not grown in Central Asi