Option B correctly fills in the blank to meet the specified requirements. Option B uses the “cloudFiles.schemaLocation” option, which is required for the schema detection and evolution functionality of Databricks Auto Loader. Additionally, option B uses the “mergeSchema” option, which is required for the schema evolution functionality of Databricks Auto Loader. Finally, option B uses the “writeStream” method, which is required for the incremental processing of JSON files as they arrive in a source directory. The other options are incorrect because they either omit the required options, use the wrong method, or use the wrong format. References:

Configure schema inference and evolution in Auto Loader: https://docs.databricks.com/en/ingestion/auto-loader/schema.html

Write streaming data: https://docs.databricks.com/spark/latest/structured-streaming/writing-streaming-data.html