The answer is D. Ethanol.
The answer is the New Kindom:)
Trade is when two or more people exchange items such as food , money , books and etc...
When our country = America ( USA ) trades goods such as money , or food and medical supplies to other countries ( Nations ) to help them and in return we might get more supporters or better Technology.
I really hope that this helps you out a lot.
Idk sorry I would help you but I didn’t do that one