Final answer:
If governors protest a federal shelter in place order as federal intrusion, it likely relates to the d. Tenth Amendment, which reserves powers not granted to the federal government to the states and the people.
Step-by-step explanation:
If the U.S president declares a national shelter in place order and social distancing requirement, and some governors protest the federal intrusion, it is most relevant to look at the d. Tenth Amendment. The Tenth Amendment indicates that powers not listed in the Constitution for the federal government remain with the states and the people.
This means that if the Constitution does not explicitly grant the federal government the power to issue such an order, then the states would have the right to object on the grounds that such powers are reserved for the states.
However, under certain conditions, such as a national emergency, the federal government might assert powers to protect the general welfare under different provisions. It's a complex intersection of federal and state authority where the specific circumstances and legal arguments matter greatly.