The relative abundance of three types of rocks ( igneous-metamorphic- sedimentary) in the earth’s crust is_________?
A. 12.5 % -12.5 % – 75%
B. 64.7 % – 27.4 % – 7.9 %
C. none of A & B
D. 7.9% – 27.7 % – 64.4