______ refers to a sociolinguistic situation two varieties of a language exist side by side throughout the community, with each having a definite role to play.

A．an introduction to a collection of Japanese folktales
B．the memoirs of a samurai warrior
C．an economic history of Japan
D．a modem novel about eighteenth - century Japan

A．trade had fallen off
B．the coinage had been sharply debased
C．spending had outdistanced income
D．profits from mining had declined