Final answer:
The timeline in video-editing apps displays the sequence of clips, where editors can arrange and edit their video project.
Step-by-step explanation:
In many video-editing apps, the component that displays the sequence of clips where you can arrange, trim, and time your clips is known as the timeline. The timeline is an essential tool for editors as it allows them to see the chronological sequence of their video clips, audio tracks, and even transitions. In context, the correct answer is A. Timeline. The other options provided, such as deck, playhead, and stream, serve different purposes. The deck is a term not commonly used in digital video editing software, the playhead refers to the current position indicator within the timeline, and the stream is related to the continuous flow of data, often used in the context of live streaming or playing back video over the internet.