An AP Oblique Sacroiliac Joint Projection (RPO Position) with Poor

Multiple Choice

An AP oblique sacroiliac joint projection (RPO position) with poor positioning demonstrates a closed sacroiliac joint, the superior and inferior sacral alae without superimposition, and the lateral sacral ala superimposed over the iliac tuberosity. How was the positioning setup mispositioned for such a projection to be obtained?

A) The pelvis was insufficiently rotated.
B) The pelvis was overrotated.
C) The central ray was not angled.
D) The central ray was centered too medially.