An ecological footprint is the A. Mark a persons shoe makes in soft earth
B. Number of animals a person has killed
C. Amount of land and ocean area needed to support one person
D. Number of trees people cut down

C. Amount of land and ocean area needed to support one person.

Explanation:

The ecological footprint of a person is the amount of land or resources that are required for the maintenance and survival of a person. In simpler terms, it is the level of impact that an individual has in terms of the productive land and resources required for the person to survive.

This ecological footprint allows scientists to check and keep track of the impact of human activities in terms of the land and water used by an individual for his/ her survival. And this date will provide details about any biologically productive land or water areas, giving an estimate of the area needed to provide the renewable resources for the perpetual cycle of nature for the individual.

Thus, the correct answer is option C.