a) the railroads destroyed native americans way of life
from the picture, you can infer that the native americans are not used to such technology (hence, why theyre still on horses). You also notice that they do have weaponry to fight against the others on the railroad. a is the most fitting and truthful answer
hopefully it helped, if you have any questons lmk!
B) Chiang Kai-shek was the Chinese Nationalist leader who struggled to prevent communism in China
