The factor that would help to reduce the amount of C)2 in an area is "Increasing the number Of photosynthetic plants" (Option C)
Increasing the number of photosynthetic plants is effective in reducing CO2 levels because of photosynthesis.
During photosynthesis, plants absorb CO2 from the atmosphere and convert it into oxygen and glucose, storing carbon in their tissues. This natural process acts as a carbon sink, mitigating the impact of excess CO2, a greenhouse gas linked to climate change.
By promoting plant growth, particularly photosynthetic ones, we enhance this vital ecological mechanism, balancing the carbon cycle and contributing to a healthier environment with lower atmospheric CO2 concentrations.
Thus, option C is the right answer.