Through Molecular Interaction of the Macromolecules in the Primitive Ocean,the $\rarr$

Through molecular interaction of the macromolecules in the primitive ocean,the self-replicating system of ____ evolved.

A) protein $\rarr$ RNA $\rarr$ DNA
B) protein $\rarr$ DNA $\rarr$ RNA
C) RNA $\rarr$ protein $\rarr$ DNA
D) RNA $\rarr$ DNA $\rarr$ protein
E) DNA $\rarr$ RNA $\rarr$ protein