What Explains the Origin of Organic Molecules on Earth

What explains the origin of organic molecules on Earth? 

A)  formation of inorganic molecules around hydrothermal vents in the ocean floor 
B)  formation of multicellular eukaryotes from inorganic molecules in the seas 
C)  formation of the first protocells from inorganic molecules on land 
D)  formation of organic molecules from inorganic molecules and an energy source