The correct answer is D – Classification. In this scenario, the goal is to assign each social media review to one of three predefined categories: positive, negative, or neutral. According to AWS documentation, classification models are used when “inputs must be mapped to one label from a fixed set of possible labels.” Sentiment analysis is one of the most common NLP classification tasks and is supported in Amazon Comprehend, Amazon SageMaker, and Amazon Bedrock. Open-ended generation produces free-form text and is not appropriate for categorical outputs. Summarization condenses long-form content, and machine translation converts text across languages. Only classification aligns with sentiment detection, enabling the model to learn sentiment cues such as emotional wording or tone markers. AWS highlights sentiment classification as a key use case for supervised learning with text data.

Referenced AWS Documentation:

Amazon Comprehend Documentation – Sentiment Classification

AWS ML Specialty Guide – Classification Algorithms