Which of the following describes the position of the inferior vena cava in relation to the abdominal aorta?
A. The inferior vena cava runs perpendicular to the abdominal aorta.
B. The inferior vena cava runs parallel to the abdominal aorta on the right side.
C. The inferior vena cava runs parallel to the abdominal aorta on the left side.
D. The inferior vena cava is inferior to the abdominal aorta.