Which characteristic could be a basis for organizing experimental films?

Organizing experimental films can indeed take many forms, and the most inclusive basis for categorization is the option that encompasses all responses. Experimental films often defy traditional boundaries, which means they can be categorized in numerous ways, including their structure, editing techniques, and genre.

Choosing "All of these responses" acknowledges that while some experimental films might have a strict narrative structure, employ conventional editing techniques, or demonstrate clear genre identification, many do not adhere to these conventions. This reflects the inherent diversity and innovation within the genre of experimental film.

In practice, experimental films might experiment with narrative and often reject conventional understanding of storytelling, editing, and genre. Therefore, while strict narrative structures, conventional editing techniques, and clear genre identification can be elements of some experimental films, the essence of experimental cinema is its ability to push beyond traditional definitions and expectations. This makes the comprehensive approach of "All of these responses" the most accurate basis for organizing them.