Your Panoramic Radiograph Reveals Narrow Anterior Teeth, the Spinal Column

Your panoramic radiograph reveals narrow anterior teeth, the spinal column superimposed over the ramus, and overlapped premolar contact areas. Identify the cause of this error:

A) patient was too far back from the focal trough
B) patient did not hold the tongue against the palate during exposure
C) patient's chin was tilted down too far
D) patient was too far forward in the focal trough