I know it might be too late, but I believe the answer is B) US research and design with mostly Asian production.
It really depends on which war the question is referring to, but if it's referring to WWII the answer would be true.
In April of 1869, he obtained a patent for one of his most important inventions, the air brake. This device enabled trains to be stopped with fail-safe accuracy by the locomotive engineer for the first time and was eventually adopted on the majority of the world's railroads
Abandoned where? if it’s in China I think it was in 2001
