Which info-eruropean people reached the farthest west?

the Celts

Explanation:

The Celts were a collection of tribes with origins in central Europe that shared a similar language, religious beliefs, traditions and culture.

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.

it was the "4. potsdam" conference that demanded the unconditional surrender of japan, since it was clear that the japanese would continue to find until the very last man otherwise.