Answer:
a- to free enslaved people
The passage describes a document that was written with the purpose of freeing enslaved people. It states that on the first day of January, in the year of 1863, "all persons held as slaves within any State or designated part of a State, the people whereof shall then be in rebellion against the United States, shall be then, thenceforward, and forever free". The document also states that the Executive Government of the United States, including the military and naval authority thereof, will recognize and maintain the freedom of such persons, and will do no act or acts to repress such persons, or any of them, in any efforts they may make for their actual freedom. The document doesn't issue orders to government officials, doesn't declare that slavery is morally wrong, neither punishes rebellious slaves, but rather it aims to free enslaved people.