​Which one of the following countries has contributed the maximum towards CO₂ emissions over the last decade?​

Correct option is C

Explanation-

CO₂ (carbon dioxide) emission refers to the release of carbon dioxide gas into the atmosphere. Over the past decade, China has been the largest contributor to global carbon dioxide (CO₂) emissions.
This is due to:
    1.  Heavy dependence on coal for energy.
    2.  Rapid industrialization and urbanization.
    3.  Massive manufacturing output, making China the "world's factory."
 Approximate share of global CO₂ emissions (recent decade):
                  China – ~28–30%
                   USA – ~15%
                   India – ~7%
                 Russia – ~5%

So, the correct answer is option C – China
Because:
   1. It emits the most CO₂ annually in the world.
   2. It has high industrial output and coal usage.
   3. Population size and energy demands are massive.
These factors combined make it the top emitter over the past decade.