Step 1: Understanding Non-Destructive Video Editing Assets:
Professional video editors (e.g., Adobe Premiere Pro) employ a non-destructive database model. This means that when you import a video asset from the system, the editor does not duplicate or alter the original video file on disk. It simply creates an internal database reference.
Step 2: Source Clip vs. Clip Instance:
The master database asset created in the Project panel upon importing is called the Source Clip. This represents the raw reference to the media file on disk and is listed only once by default in the Project panel. If you drag this clip onto the Timeline sequence multiple times, you generate multiple dependencies called Clip Instances.
Step 3: Verification of Terms:
Because the question specifically addresses the primary asset imported and listed exactly once in the Project panel, Option (B) is the accurate answer.