Easy. By learning and studying language patterns.
Before the advent of public conventions, the nominees for president were selected by a small group of privileged citizens in closed meetings. These individuals would have been adult white male citizens of a certain level of wealth and power.
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Answer:
It proclaimed the freedom of slaves in the ten Confederate states still in rebellion. It also decreed that freed slaves could be enlisted in the Union Army, thereby increasing the Union's available manpower.
So I'm guessing D or B.
¿De qué catedral y peregrinos hablas?