Answer: C. Chief executive of the government.
Explanation:
As Chief Executive of the government, American presidents have certain powers vested upon them by the Constitution such as the power to implement policy and make Executive orders. As the Chief Executive they are the most powerful figure in the executive branch.
The Emancipation Proclamation was an Executive Order that was from thence meant to dictate the way the Federal government was to react to slavery. This power therefore fell under President Lincoln's powers as Chief Executive.
