Which of the Following Illustrates the Idea of Sustainable Development

Which of the following illustrates the idea of sustainable development through technological cooperation?

A) Worldwide conferences to encourage developing countries to invest in technological joint ventures with other developing countries.
B) The development of long-term partnerships between companies in developed and developing countries to transfer environmental technologies.
C) Advanced countries developing and selling at a profit environment technologies to developing countries.
D) All countries developing their own environmental technology in order to solve their own problems.