Final answer:
The Old Testament contains a significant amount of narrative, influenced by earlier traditions such as Mesopotamian legends, with stories such as that of Moses and the flood.
Step-by-step explanation:
The question 'How much of the Old Testament is narrative?' refers to the type of literature found in the Hebrew Bible or Old Testament. Narrative constitutes a significant portion of the text, detailing historical events, stories of individuals, legal codes, and prophecies. However, the numbers listed as options (20, 30, 40, 50) are not specifically referenced in historical analysis as percentages representing the narrative content of the Old Testament. Thus, without a specific context or source defining these percentages, any answer would be speculative. It's worth noting that narratives within the Old Testament, such as the stories of Moses and events like the flood, often reflect and are influenced by earlier traditions from other cultures such as Mesopotamian legends and are not strictly historical accounts verifiable by empirical evidence.