Final answer:
The most appropriate control for the digestion of gelatin in camera film would be exposed camera film without enzymes.
Step-by-step explanation:
The most appropriate control for the experiment involving the digestion of gelatin in camera film would be A) Exposed camera film without enzymes. A control is a sample that does not receive the treatment being tested, so in this case, the gelatin in the camera film would not be exposed to any enzymes. This control is necessary to compare the results and determine the effect of the enzymes on gelatin digestion.