Which of the Following Statements Is True

Which of the following statements is true?

A) Human activity has not yet surpassed the regenerative biocapacity of the Earth, but with another decade of rapid economic growth in China, Earth's capacity to supply its services will be surpassed.
B) Some environmentalists have calculated the global human ecological footprint in terms of the number of earths it takes to support human economic activity.
C) The human population on Earth began using services at a rate that exceeded the capacity of the Earth's ecological system to replenish itself shortly after the beginning of the Industrial Revolution.
D) The Green Revolution has provided the technological progress to reduce humans' ecological footprint to the point that the Earth can again regenerate all of nature's services at a sustainable level.