Which two pieces of evidence support the idea that the supply of coal will run out soon?
OA. only five percent of the available coal is mined and used for various purposes, and
the fact that its lower portions are wasted
OB. America has the richest portion on earth with respect to coal and the fact that it needs
to conserve it for future generations
OC. anthracite coal will run out in fifty years and the fact that bituminous coal will run out in
two hundred years
OD. coal fields in lowa and Missouri are already exhausted and the fact that coal is not
used conservatively