The Tenth Amendment to the United States Constitution reserves powers not delegated to the federal government by the Constitution, nor prohibited to the States, to the States respectively, or to the people. Therefore, it does not grant any powers to the federal government; instead, it emphasizes the principle of federalism by stating that any powers not specifically assigned to the federal government are reserved for the states or the people.
The correct interpretation related to your options would be that the Tenth Amendment underscores that the federal government only has powers explicitly granted by the Constitution. So, among the provided options, "Only the powers explicitly granted by the Constitution" is the most accurate reflection of the Tenth Amendment's intent regarding federal powers.