Answer: Option B
Step-by-step explanation:
The respiration can be defined as a process by the living organism except few intake the oxygen and exhale carbon dioxide.
Though there are many other factors that release carbon dioxide into the atmosphere but respiration is the major contributor of carbon dioxide among all.
The plants provides us with oxygen which is used by the animals and human beings for the process known as cellular respiration. As a by product of this process carbon dioxide and water is released.
This is a source of carbon for the plants which uses it for the process of photosynthesis.