During which era did the first fish develop?

Scientists studying the origin of life have accomplished which of the following steps?

a. Abiotic synthesis of protocells with self-replicating, catalytic RNA

b. Formation of vesicles that use RNA as a template for DNA synthesis

c. Formation of protocells that use DNA to direct the polymerization of amino acids

d. Abiotic synthesis of RNA’s bases (A, C, G, U)

Each option below lists several of the major events in the history of life on Earth. Which option presents the events in the correct order from the oldest to the most recent?