Art has always been ____ of raising consciousness and sending a

Art has always been ____ of raising consciousness and sending a message.
A、means
B、a means
C、a mean
D、some mean
【正确答案】：B
【题目解析】：此句的意思是艺术一直是唤醒意识和传递信息的方式。Means指方式是可数名词，因此选B。