The Classification of Coal Is Based on the Concentration of Carbon

Multiple Choice

The classification of coal is based on the concentration of carbon in the rock.Which of the following chain of processes causes the concentration of carbon to increase?

A) burial à decay of plant matter à release of organic molecules à concentration of carbon
B) burial à chemical reactions à release of gases à concentration of carbon
C) decay of plant matter à burial à release of gases à concentration of carbon
D) chemical reactions à burial à release of gases à concentration of carbon