Final answer:
The state must have legal jurisdiction and extend privileges and immunities to a citizen from another state engaging in activities within its borders. This is in accordance with Article IV, Section 2 of the U.S. Constitution.
Step-by-step explanation:
When a citizen of one state engages in basic and essential activities in another state, the state must have legal jurisdiction and the ability to extend the privileges and immunities of its own citizens to those from other states. The correct answer to the question is that for a state to accommodate a citizen from another state, it must be equipped to provide them with privileges and immunities equal to those of its own residents. This is backed by Article IV, Section 2 of the United States Constitution, which states that "The citizens of each state shall be entitled to all privileges and immunities of citizens in the several states." This Constitutional provision ensures that states do not discriminate against citizens of other states and foster a sense of unity and cooperation amongst the states, eliminating the potential compulsion for each state to act as a separate entity, like a little independent country.