Will mark !
how have present-day societies been affected by european imperialism?
a- ongoing rebellions continue against the british commonwealth
b- all european countries now have a president or king appointed by the british
c- crudely-devised boundary lines have led to internal conflicts in countries
d- the concept of social darwinism is now stronger than ever before

C- crudely-devised boundary lines have led to internal conflicts in countries

Explanation:

When European imperialism went to the other continents what started to happend is the conquering of different countries and nations, the main problem with this was that under the european influence and power people was unified under a more powerful nation, when the european nations power started to fade away, the way in which nations were divided started to change, this was because people often want to be organized in a nation by historical points in commo, culture shared and other attibutions, once they had their freedom, more often than not, they didn´t like with who they were made into a nation.

the answer is c. hope this