Which video format was originally designed for streaming content online?

The answer is B, as FLV (Flash Video Format) was specifically designed to deliver video content over the internet, particularly suited for streaming. Developed by Adobe, this format became widely used for embedding videos on websites, especially during the rise of online video platforms in the early 2000s. Its ability to efficiently compress video files while maintaining quality made it ideal for the slower internet speeds of that era.

Other formats, while capable of streaming content, were not originally designed with streaming in mind. For instance, AVI is a container format that carries high-quality video but lacks the compression needed for efficient streaming. MOV is associated with Apple's QuickTime and is more focused on providing high-quality playback rather than online streaming. MP4 is a more versatile format that supports streaming as well, but it wasn't initially created solely for that purpose as FLV was. Thus, FLV stands out for its specific role in the early development of online video streaming technologies.