Sandra notices the dark line separating each of the countries on the map of europe. what line is she looking at?
a. border
d. both a and b
b. neatline e. none of these
c. separation line

A, which are the border lines

Explanation:

The border line in the map are dividing lines between countries, states, provinces, counties.

The lines identifies the boundaries of a country.

So in summary, the dark line Sandra noticed separating counties in Europe is known as the Border Line

italian workers migrated to northern provinces