Losing favor after 1828, the earliest method of nominating candidates for office was the legislative caucus. The correct option among all the options given in the question is option "A". The actual meaning of caucus in terms of politics is the gathering of supporters of a common political party. Although the term appeared in the United States of America, but later on it spread to other countries like Australia, Canada etc.
I think the difference is caused by a person or group actually going through with genocide versus an attempt at it, but that's just my best guess?
I would go with C cause its the only one that would go along the lines of buying or selling
Rome-Berlin Axis
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