Why was the goal of landing a person on the moon so challenging?
People did not know very much about the moon.
The Soviet Union had already started preparing a moon mission.
Many of the necessary technologies had not been invented yet.

C is answer

a is the final : )

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.

this is true many people think today that blacks should be slaves also known as rasisim calling them many insults from slavery the idealogy of the south still exsist in some parts but not all