Biology

The activity most responsible for increasing the amount of carbon dioxide (CO₂) in the atmosphere is: B.Deforestation and burning of fossil fuels

Explanation:

Deforestation and burning of fossil fuels are the primary human activities responsible for the rise in atmospheric CO₂. Deforestation reduces the number of trees that can absorb CO₂ through photosynthesis, while the burning of fossil fuels (such as coal, oil, and natural gas) directly releases large amounts of CO₂ into the atmosphere.