Ineed with question 15 and it’s very hard and i’m struggling with it and if you need to see the picture big then click on it and it will be big

The large increase in atmospheric carbon dioxide in the last 50 years most likely comes from a. an increase in cellular respiration b. increased decomposition by bacteria c. an increase in the burning of fossil fuels d. an increase in photosynthesis

What is the problem in this article? what solution does the article propose?

Stephen is a student who wants to test his knowledge of medical terminology. which option could he use?