If the hypothesis that protocells were based on an "RNA world" is correct,what would be necessary to shift to a "DNA world"?

Question

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The transition from an "RNA world" to a "DNA world" would require several biochemical innovations: an enzyme or reaction to modify ribose to deoxyribose (A), reverse transcription mechanisms to convert RNA sequences into DNA (B), replication enzymes specific to DNA (C), and transcription enzymes to produce RNA from DNA templates (D). Thus, all these components are necessary for the shift.

If the Hypothesis That Protocells Were Based on an "RNA