D would be your answer that I seem fit.
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The power used by President Jefferson which the Constitution did not explicitly delegate to him is known as Inherent power
Inherent power refers to those power not explicitly specified in the Constitution and allows government to take actions necessary to efficiently perform essential duties
1. The significance of the Inherent power is to allows government to take actions necessary to efficiently perform essential duties
2. Since President Jefferson found that the purchase of Louisiana Territory will enable the country gain control of the crucial Mississippi River port of New Orleans, then it is a good thing.
3. There are no risk because the president will weigh the consequence.
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Answer: freed all people enslaved in states still in rebellion against the Union after January 1st, 1863.
Explanation: proclaimed the freedom of slaves in the ten Confederate states still in rebellion. It also decreed that freed slaves could be enlisted in the Union Army, thereby increasing the Union's available manpower.