Which of these choices is the primary purpose of the Ramsar Convention

As the choices are not given, so let's have a look at the Ramsar Convention in general.

Explanation:

In 1971, different countries around the globe signed a treaty in Ramsar, Iran for the conservation and sustainable usage of different wetlands around the world. The conservation of wetlands is important because the wetlands have a diversified flora and fauna. Destruction of the wetlands would result in many animals and plant species around the world to become extinct or endangered. Hence, this treaty was signed by different countries of the world as an understanding of the current situation of the wet lands.

to conserve wetlands