Answer this correctly

which of the following statements about the emancipation proclamation is correct?

a. it did not completely satisfy abolitionists or supporters of slavery.
b. at first, it did not free a single enslaved person.
c. as the war went on, it freed all the enslaved people in the north and the south.
d. it fulfilled lincoln's election promise to end slavery in the united states.

missouri compromise of 1820 which prohibited slavery

simplify brackets

8 - 2a - 7 = a + 40

simplify 8 - 2a - 7 to -2a + 1

-2a + 1 = a + 40

add 2a to both sides

1 = a + 40 + 2a

simplify a + 40 + 2a to 3a + 40

1 = 3a + 40

subtract 40 from both sides

1 - 40 = 3a

simplify 1 - 40 o -39

-39 = 3a

divide both sides by 3

-39/3 = a

simplify 39/3 to 13

-13 = a

switch sides

a = -13

i think it's b

the colonial period, since this was a time of mass immigration from a variety of people from europe.