A clustering depth of 1 in Snowflake indicates that there are no overlapping micro-partitions for the specified clustering keys. This represents the optimal clustering state where each micro-partition contains distinct ranges of values, minimizing data scanning during queries. The community discussion strongly supports option C with 73% consensus, citing Snowflake documentation that shows clustering depth = 1 means no overlapping micro-partitions. Options A and D are incorrect because a populated table would have multiple micro-partitions, and option B is incorrect because overlapping micro-partitions would result in a clustering depth greater than 1.