Why did Lincoln decide to issue the emancipation proclamation and what it achieved?

i think the answer is c, rivers.

explanation:

sometimes, borders fall along natural boundaries like rivers or mountain ranges. for example, the boundary between france and spain follows the crest of the pyrenees mountains. for part of its length, the boundary between the united states and mexico follows a river called the rio grande. the borders of four countries divide africa’s lake chad: niger, chad, cameroon, and nigeria.

answer; (a) he was a u.s senator for 38 years;

d. it spread christianity. i just took the test and got it right.