It can be inferred from the passage that a major interest of the officials of Glacier National Park is to ______

A．What factors led to the stylistic improvement in the literary works of black writers in the post-war period
B．Who were the leading exponents of protest literature during the Harlem Renaissance
C．Why were the writers of the Harlem Renaissance in rebellion against foreign ideological systems
D．With what specific socioeconomic causes did the Black writers of the post-war period associate themselves

A．They needed to increase their commitment to international solidarity.
B．Their awareness of oppression caused them to reject American society.
C．They transformed their increasing social and political consciousness into art.
D．Their art suffered from their over-involvement in political crusades.