You are observing an operation to remove the left suprarenal gland. To expose the gland, the surgeon mobilizes the descending colon by cutting along its lateral attachment to the body wall and dissecting medialward in the fusion fascia behind it. Suddenly, the operative field is filled with blood. The surgeon realizes he has failed to cut a mesenteric attachment between the left colic flexure and another organ. As a result of the traction, the surface of the organ tore. Which organ was injured?

A) Liver
B) Spleen
C) Stomach
D) Pancreas