解决精神与物质、思维与存在、主体与客体、人与自然对立统一关系的基础是

A．物质

B．精神

C．实践

D．自然界

He was driving home on the highway last night when he was stopped by a policeman，         .

A．who was charged by speeding

B．who accused him of speeding

C．which was warned of speeding

D．whom reminded him to speed