Final answer:
The ischium and pubis bones make up the obturator foramen, an opening in the hip bone that is important for muscle attachment. The ilium forms the superior part of the hip bone but is not part of the obturator foramen itself.
Step-by-step explanation:
The bones that make up the obturator foramen are the ischium and the pubis. These two parts of the hip bone converge and contribute to the margins of the obturator foramen, which is a large opening in the anteroinferior part of the hip bone. The space within the obturator foramen is mostly covered by a layer of connective tissue and is essential for the attachment of muscles.
The ilium forms the superior part of the hip bone, and while it's integral to the hip structure, it is not directly involved in defining the obturator foramen. The correct answer to the question 'What bones make up the obturator foramen?' is B) Ilium and ischium. However, considering the substance of the question and the provided reference material, the intended correct choice for this question should likely be C) Pubis and ilium, which accurately reflects the anatomy of the obturator foramen.