A is the correct answer, as noted.
Samuel Adams was the leader of the Boston based Sons of Liberty and worked to lead protests against British taxation of the colonies after the 7-Years War.
One of those protests was the Boston Tea Party.
Though many black leaders decried Lincoln’s tardy efforts to act definitively on slavery, when he finally did release the Emancipation Proclamation, both the freed and enslaved African-American community rejoiced at this decisive step towards freedom.
The answer is A) emperor :)
Checks and balances or the three government branches in the US