Answer: Amazon Transcribe

The correct answer should be **B) Amazon Polly**, not A. **Explanation:** - **Amazon Polly** is AWS's text-to-speech service that converts text into lifelike speech in multiple languages and voices. It's specifically designed for applications that need to read out text in natural-sounding speech. - **Amazon Transcribe** (option A) is for speech-to-text conversion, not text-to-speech. - **Amazon Translate** (option C) is for language translation between text. - **Amazon Comprehend** (option D) is for natural language processing and text analysis. For a mobile app that needs to read notifications in natural-sounding speech across multiple languages, Amazon Polly is the appropriate AWS service.

Author: Ritesh Yadav