Which statement is true of a treaty? a. it has to be approved by the united nations. b. it applies to governments but not to ordinary citizens. c. it must be ratified unanimously by the u. s. senate. d. it legally binds the nations that agree to it.

The correct answer is letter D.

A treaty is an agreement among nations to decide on an international law that is going to be applied for the countries that agree to it. A treaty binds the nations that sign it because they are all gonna be tied through this agreement.

i think its toxic gasses but i could be wrong