The correct answer is B: Update SQL pipelines to run as batch queries, and run ad-hoc queries as interactive query jobs. This approach effectively manages concurrency by scheduling non time-sensitive batch queries during off-peak hours, thus reducing peak-time concurrency. Interactive query jobs are better suited for ad-hoc queries, allowing for optimized resource allocation.

• Option A is incorrect because merely increasing slot capacity without optimizing query types and scheduling may not efficiently manage the workload.
• Option C might offer some relief but isn't as efficient as optimizing query types and scheduling.
• Option D is not ideal because running all queries as interactive may not be suitable for non time-sensitive operations, leading to inefficient resource use.