The maximum amount of CO2 fixed by green plants by way of photosynthesis in a year is:

A. 9 x 1013 kg
B. 8 x 1012 kg
C. 9 x 1011 kg
D. 8 x 1010 kg

The correct answer to the question: "The maximum amount of CO2 fixed by green plants by way of photosynthesis in a year is:" is "9 x 1013 kg ".