Explanation:

Amazon Textract is specifically designed for extracting text, forms, and tables from scanned documents. It can identify and extract key-value pairs from documents like invoices, forms, and receipts. Here's why:

1. Amazon Textract is an AWS service that uses machine learning to automatically extract text, handwriting, and data from scanned documents.
2. It can identify form data (key-value pairs) and table data from documents, making it ideal for processing invoices, forms, and receipts.
3. Amazon Rekognition is for image and video analysis (object detection, facial recognition).
4. Amazon Comprehend is for natural language processing (sentiment analysis, entity recognition).
5. Amazon OpenSearch is a search and analytics engine.

For extracting structured data like names and amounts from scanned invoices, Amazon Textract is the correct choice.