AWS Batch is the correct service for this requirement because:

• AWS Batch is specifically designed for running large-scale batch computing workloads on AWS
• It automatically provisions compute resources and optimizes the job distribution
• It can efficiently handle hundreds of thousands of computing jobs by dynamically scaling the required infrastructure
• AWS Batch manages the queuing, scheduling, and execution of batch jobs across the full range of AWS compute services

Why other options are incorrect:

• AWS Step Functions: Used for orchestrating workflows and coordinating multiple AWS services, not specifically optimized for large-scale batch computing jobs
• AWS Service Catalog: Used for creating and managing catalogs of IT services, not for running computing jobs
• Amazon SQS: A message queuing service for decoupling application components, but doesn't provide the full job scheduling and compute management capabilities needed for this scale of batch processing