Explanation

Amazon QuickSight is the correct choice because:

• Purpose-built for BI: Amazon QuickSight is specifically designed for business intelligence and data visualization
• Interactive dashboards: It allows creation of interactive dashboards with drill-down capabilities
• Pay-per-session pricing: QuickSight uses a pay-per-session model with no upfront costs or long-term commitments
• Integration with Redshift: It seamlessly integrates with Amazon Redshift for direct data analysis
• Cost-effective: The pay-per-session model means you only pay when users actually access the dashboards

Why not the others:

• Amazon CloudWatch: Primarily for monitoring AWS resources and applications, not for business intelligence dashboards
• AWS Health Dashboard: Shows AWS service health and personal account health, not for custom business intelligence
• AWS Service Catalog: Manages approved IT services, not for data visualization or dashboards

Amazon QuickSight's pay-per-session pricing model perfectly matches the requirement of no upfront costs while providing the interactive dashboard capabilities needed for business intelligence solutions.