From Where Does the Name "Greenstone" in Greenstone Belts Originate

From where does the name "greenstone" in greenstone belts originate?

A) Greenstone belts formed on land.
B) Many of the minerals in greenstone belts are green.
C) Greenstone belts contain the earliest algal fossils.
D) The origins of greenstone belts were first described by the geologist Nathaniel Greene.
E) The type locality for greenstone belts is in Greenland.