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The choice that includes the Vision API, Speech-to-Text API, and Video Intelligence API is optimal for an image processing pipeline because it covers different aspects of processing visual and audio data effectively.

The Vision API is specifically designed for image analysis and processing tasks. It offers capabilities such as object detection, face detection, image labeling, and logo detection, making it an essential tool for any image processing pipeline that requires understanding and interpreting visual content.

Incorporating the Video Intelligence API enhances the capabilities by allowing for the analysis of video content, which primarily consists of a sequence of images. This API can detect objects, recognize explicit content, and even track changes over time across video frames, thereby adding a crucial layer for applications that involve video processing alongside still images.

While the Speech-to-Text API may not directly relate to image processing, it plays a supportive role in a multi-modal pipeline by converting audio from video into text, thus providing additional context for the visual content. In scenarios where images and videos contain audio narrations or dialogs, integrating this API can enrich the data processing and understanding.

This combination makes the selected choice robust for handling tasks around both image and video processing, therefore supporting a comprehensive image processing pipeline.