The transtubercular plane of the abdominopelvic region is ________.

A) inferior to the umbilicus and crosses the abdomen at the level of the superior hips
B) positioned slightly medial to the left nipple
C) to the umbilicus at the level of the pylorus
D) positioned slightly medial to the right nipple

The transtubercular plane is a horizontal plane that passes through the superior edges of the iliac crests (which are also known as the superior hips). This plane is located inferior to the umbilicus and divides the abdominopelvic region into two parts: the abdominal region (superior to the plane) and the pelvic region (inferior to the plane). Therefore, choice A is the correct answer. Choices B, C, and D are incorrect as they do not accurately describe the location or orientation of the transtubercular plane.