There was an announcement in German,but Hank paid no _.There was something else he paid _.

There was an announcement in German,but Hank paid no _.There was something else he paid _.
A.attention ;attention B.attention to;attention to
C.attention to;attention D.attention;attention to
我知道pay attention to,但为什么前面一个空要填attention，而后面填attenton to呢？