Which Azure service provides natural language processing capabilities?

Correct answer: Azure Text Analytics

Azure Text Analytics, now part of Azure AI Language, provides natural language processing capabilities including sentiment analysis, key phrase extraction, named entity recognition, and language detection. Option B is correct because Text Analytics is specifically designed for NLP workloads. Option A is incorrect because Azure Cosmos DB is a globally distributed NoSQL and multi-model database service with no native NLP functionality. Option C is incorrect because Azure App Service is a platform for hosting web applications and APIs, not a cognitive or AI service. Option D is incorrect because Azure Virtual Machines are general-purpose compute resources; any NLP capability would have to be manually installed and configured, and VMs themselves provide no NLP features.