Final answer:
The ideal temperature and humidity conditions for film storage are between 50° F and 70° F with relative humidity levels of 30% to 50%.
Step-by-step explanation:
The ideal temperature and humidity levels for film storage are between 50° F (10° C) and 70° F (21° C) with relative humidity levels of 30% - 50%. This controlled environment helps to preserve the chemical structure of the film, preventing degradation over time. Therefore, the correct answer is A.50° F - 70° F; 30% - 50%.