According to the passage, methods of exploring for gold that are widely used today are bas
A.Most of the Earth’s remaining gold deposits are still molten.
B.Most of the Earth’s remaining gold deposits are exposed at the surface.
C.Most of the Earth’s remaining gold deposits are buried and have no surface expression.
D.Only one type of gold deposit warrants exploration, since the other types of gold deposits are found in regions difficult to reach.
E.Only one type of gold deposit warrants exploration, since the other types of gold deposits are unlikely to yield concentrated quantities of gold.