What would cause increased magnification, decreased resolution, and edge sharpness?

When considering factors that lead to increased magnification, decreased resolution, and edge sharpness, all listed options are relevant as they each contribute to these effects.

Increased focal spot size leads to a larger area of the x-ray beam being produced. This results in a reduction in detail because a larger focal spot produces more scatter, which can blur the image and reduce overall sharpness.

Decreased source-object distance means the x-ray tube is positioned closer to the object being radiographed. While this could potentially lead to an increase in detail, if the distance is decreased too much, it can also lead to an increase in magnification of the image, particularly when the object being imaged is three-dimensional.

Increased object-film distance is another significant factor. As the distance between the object and the film increases, the radiographic image can appear larger (magnification) and the resolution can suffer because the x-ray beam diverges as it travels, making the edges of the image less sharp.

Thus, all the mentioned factors interplay to result in increased magnification, decreased resolution, and reduced edge sharpness, making "All of the above" the comprehensive answer.