CORRECT ANSWE R: D - Continuous trigger.

According to Microsoft Learn on Lakeflow Jobs triggers, the Continuous trigger keeps the job running perpetually and immediately processes new records as they become available --- this directly satisfies 'New records must be processed as soon as they become available.' The Continuous trigger is specifically designed for near-real-time ingestion scenarios where latency must be minimized. Option A (Manual) requires a human to start each run, adding latency. Option B (File Arrival) triggers a job when new files land in a storage location, which is appropriate for file-based ingestion but introduces per-file trigger overhead rather than true continuous processing. Option C (Scheduled) runs at fixed intervals (e.g., hourly), introducing batch latency that is inconsistent with processing records 'as soon as they become available.'