You should always remember to keep your eyes while you are driving a. on the car ahead b. moving c. on the center line

The correct answer is B.

A and C aren't correct because if you only pay attention to the car in front of you, you won't be able to know what's going on behind or next to you. You also shouldn't keep your eyes on the center line because it will distract you from what is happening on the road. 
You should always keep your eyes moving while you are driving. 

Americans often speak of their country as one of several large regions.  these regions are cultural units rather than governmental units --  formed by history and geography and shaped by the economics, literature and folkways that all the parts of a region share. what makes one region different from another? a region's multicultural heritage as well as distinct demographic characteristics like age and occupation make regions different and special. within several regions, language is used differently and there are strong dialects. there are also differences in outlook and attitude based on geography.