The underlined word "heed" in the last but one sentence of the passage means ______

A．What can nature contribute to technology
B．Environment can sometimes block the progress of technology.
C．Technologies of all kinds should serve the natural environment.
D．Environment deserves the most attention in the development of technologies.

A．Environment enables man to adapt successfully to new technology.
B．Technologies enable man to adapt successfully to his environment.
C．The development of technologies depends solely on the natural environment.
D．Lack of technologies to cope with the environment is caused by lack of natural resources.