Correct Answer: C. Using Azure Cost Management + Billing for detailed analysis and recommendations

Azure Cost Management + Billing stands out as the optimal choice for monitoring Azure Databricks workspace usage with the aim of cost optimization. Here's why:

1. Comprehensive Insights: It delivers in-depth reports and analytics on how resources are utilized within the Databricks workspace, covering usage patterns and job performance.
2. Cost-Saving Recommendations: Beyond mere analysis, it proactively suggests actionable strategies for cost reduction, such as right-sizing resources and identifying underutilized assets.
3. Seamless Integration: Its direct integration with Azure Databricks facilitates straightforward cost tracking and management via the Azure portal.
4. Automation Capabilities: The tool automates the monitoring and analysis processes, offering real-time insights without the manual effort required by traditional methods.
5. Scalability: Designed to accommodate businesses of all sizes, it efficiently scales to meet the evolving needs of your Databricks workspace.

In summary, Azure Cost Management + Billing provides a robust, integrated, and automated solution for gaining actionable insights into workspace usage and uncovering cost optimization opportunities, making it the superior choice for this scenario.