Which of the Following Explains How Nucleotides Might Have Polymerized

Which of the following explains how nucleotides might have polymerized into nucleic acids in the prebiotic world?

A) a mixture of hydrogen cyanide, formaldehyde and phosphate can form nucleotides in the presence of an electrical discharge
B) nucleotides formed short polymers in the high temperatures of hydrothermal vents
C) nucleotides used the surface of clay as a catalyst to form polymers
D) catalysts such as iron sulfide allow for the formation of new C-C bonds
E) all of the above