Final answer:
Photosynthesis is not a way in which carbon gases are introduced into the atmosphere.
Step-by-step explanation:
The correct answer is c. photosynthesis. Photosynthesis is the process through which plants convert carbon dioxide into oxygen and glucose. This process actually helps remove carbon gases from the atmosphere, rather than introducing them. Forest fires, respiration, and the burning of fossil fuels, on the other hand, release carbon gases into the atmosphere.
Learn more about Carbon gases and their introduction into the atmosphere