Graphite Forms from Natural Gas as Well as Coal When

Multiple Choice

Graphite forms from natural gas as well as coal when temperatures rise.What does this imply?

A) Coal and natural gas molecules decompose to carbon and other matter when temperature rises.
B) Coal and natural gas molecules are transformed by neutron bombardment into carbon.
C) The precursors of natural gas and coal were graphite or other pure carbon.
D) Coal and natural gas must be less dense than graphite.