Answer: If you're underage or possibly if you're still on their insurance
Explanation:
National border is the type of border among the following choices given in the question that would likely have the most protection. The correct option among all the options that are given in the question is the third option or the penultimate option. I hope the answer helps you.
B) Kelper: planetary orbits
Kelper had a similar theory of Copernicus
