be aware of sth.当心某事,意识到某事：Be aware of those who fish in troubled waters.当心那些混水摸鱼的人.
be aware that 意识到：He is quite aware that the danger is coming.他意识到危险正在来临.
这里指当心违法,我想B更好些.我当时也是选的B，可是答案是C我问别人了，似乎aware that加的是从句，aware of加名次或短语