Which of the Following Defines the Earth's Carrying Capacity

Multiple Choice

Which of the following defines the earth's carrying capacity? 

A)  The number of tons of edible food that can be produced by all of the earth's cultivable land 
B)  The maximum number of living organisms that can be supported in an environment over time 
C)  The amount of oxygen consumed by all living organisms in relation to the amount of oxygen produced by all living plants 
D)  The total weight of all living organisms in relation to the weight of all non-living material including the earth's water mass 
E)  The maximum number of people who can exist on earth without causing environmental damage.