Which best describes a video sequence in Adobe Premiere Pro?

A video sequence in Adobe Premiere Pro is best described as a group of video clips and audio laid out in the workspace. This definition encapsulates the core functionality of sequences within the software, which allows users to organize and edit multiple clips collaboratively. Sequences are the building blocks of your project, where all edits, transitions, and audio adjustments occur.

In a sequence, you can layer different video and audio tracks to create a cohesive story or narrative, making it essential for any editing process. This arrangement allows for a dynamic editing environment where adjustments can frequently be made.

The other choices do not fully represent what a sequence is. For instance, a single video clip placed in the timeline lacks the complexity and multi-layering that sequences facilitate. Similarly, while the application of effects is a crucial aspect of the editing process, it does not encompass the entirety of what makes a sequence. A timeline with only audio tracks visible also fails to represent the full scope of a video sequence, which typically includes both audio and video elements.