The correct answer is Azure AI Language sentiment analysis.

Azure AI Language sentiment analysis is designed to determine the emotional tone of text and it can classify comments as positive negative or neutral while providing confidence scores. This makes it the appropriate choice for monitoring user comments and detecting posts that convey negative sentiment because it directly measures tone and can be integrated into alerting or moderation workflows.

Azure AI Language key phrase extraction extracts important words and phrases from text and it does not provide sentiment classification so it cannot tell you whether comments are negative.

Azure Content Safety focuses on detecting harmful or policy violating content and it is useful for moderation but it is not primarily designed to measure emotional tone or sentiment.

Azure AI Language named entity recognition identifies people organizations locations and other entities in text and it does not indicate the emotional tone of a message.

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