What would be detrimental to radiographic image sharpness?

The choice that indicates a factor detrimental to radiographic image sharpness is a large object-to-film distance. In radiographic testing, sharpness is primarily influenced by the distance between the object being radiographed and the film or detector capturing the image. As the distance between the object and the film increases, the image becomes more blurred due to the divergence of the X-ray beam. This blurring can cause a loss of detail and reduce the overall clarity of the image.

Maintaining a short object-to-film distance helps to minimize this blurring effect, allowing for crisper details in the radiographic image. Conversely, small object size enhances sharpness because smaller objects produce less geometric unsharpness. High exposure times can also contribute to better image quality by allowing for enough radiation to reach the film, though it does not directly relate to sharpness like the object-to-film distance does. Thus, a large object-to-film distance detracts from image quality by causing blurring, making it the correct answer in this context.