The complete question is:
Which of these processes produces oxygen? A) burning coal for heat B) respiration in animals C) photosynthesis in plants D) operation of an acetylene torch
Answer: Photosynthesis in plants
Explanation:
The production of oxygen on earth is possible only when there is a process of photosynthesis on earth. The process by which the autotrophs make food is responsible for food and oxygen on earth.
The production of carbohydrates takes place in the presence of sunlight and carbon dioxide.
This process is also responsible for the production of oxygen in the environment.
