Stony the road we trod, Bitter the chastering rod. Its C.
B.
until - until he comes for example ( time before someone comes or something is happened)
Meanwhile - during a period or an action where another thing is happening (at that time)
Later - after some period - two months later ( after passing of some amount of time
It's impossible because technically all Americans are immigrants and we all descend from past immigrants.
I think b, since it has the prefix of end, it most likely means that its the end and noting can be done about it.