Answer: Option D
Explanation:
Ecological footprint can be defined as the affect of human activities which measured in terms of area which is biologically productive, water and land which is needed to produce the goods that is consumed and to assimilate the waste that is generated.
According to this definition, the total volume of fossil fuel, fertilizer,water and other resources that can be used to provide food is studied under ecological foot print.
Hence, the correct answer is option D