"<span>C to ensure that U.S. businesses could operate in China" is the correct answer for </span>why the <span>the United States announced the Open Door Policy</span>. This was essential for trade.
Actually the answer D)Immorality <span />
I believe it does not because self-defense is self-defense and it is right to do, but we don't have to "interfere" with other peoples stuff just because of self-defense.
The American Industrial Revolution was a time of great political, economic, and social change.