In the formal sector of an economy, labor is A based heavily on services
B. frequently done on a cash-only basis
C. regulated by law and industry standards
D based on traditional values

Hello i am going to be you today with your problems today. i believe that the answer is going to be. i hope this you have a great day.a. people around the world 

The highest point of a hill (or mountain) is a single point.
a single point can only be precisely marked with a dot. 
putting on a contour line is impossible  on a single point because the contour line is created after multiple points that have the same hight are marked, and after that, all of those points are connected with a line that creates a closed area. so the highest point, as said above, is a single point, there are no other points with the same height, so the only possible way for it to be marked is with a dot, and there is no possibility for a contour line.