Which most likely would fall under the organizing topic of technological improvement?

the graph shows the spread of railways in the 1800s.

based on the graph, the conclusion that can be drawn about germany is answer d)   by 1880, germany had more rail lines than great britain and russia.

because it took place after the war of 1812 had come to an end.

because the earth is a round globe. but that is just what they tell us it is flat and those dudes actually where lying they sailed east.