Respuesta :
The correct answer is choice D.
A treaty is a formal agreement that is reached between two or more countries. A treaty is normally signed by a leader of the country and then ratified by their lawmaking authority.
I believe it’s D. just using the process of elimination you could’ve crossed A and C because an informal agreement doesn’t even sound right. So now you are stuck with B and D and since a treaty is a formal agreement between two or more nations, D is correct