R2 Code of Practices' constitutes a tool available for promoting the adoption of

1. A

   environmentally responsible practices in electronics recycling industry

   Environmentally responsible electronics recycling. R2 is a standard for e-waste recyclers.

2. B

   ecological management of 'Wetlands of International Importance' under the Ramsar Convention

   Ramsar wetlands. Unrelated.

3. C

   sustainable practices in the cultivation of agricultural crops in degraded lands.

   Degraded-land crops. Unrelated.

4. D

   'Environmental Impact Assessment' in the exploitation of natural resources

   EIA of extractives. Unrelated.

Summary. Official key is (a). The R2 (Responsible Recycling) Code of Practices is a certification for electronics recyclers — environment, data security, downstream due diligence.