Answer:
Help with manufacturing
Explanation:
During the war people who were home worked infacstuture like factories and railroads to keep supplies coming. Women worked in factories to produce items for the war and people like my great grandfather worked the railroad to make sure items made it to the destations to be shipped to eroupe,africa, and pacific asia.
Usually, back then, they followed their food and tracked them without settling too long in one place. But since that's not one of the answers I would go with A.
I hope that helps.
prolly C.
through the introduction of Chinese art and technology
Mostly likely answer is: Diplomatic Immunity.