Select the best definition of Splenectomy.

A. Abbreviated surgery to control bleeding and contamination in a physiologically unstable trauma patient. B. Surgical removal of the spleen, increasing long-term risk from encapsulated bacteria. C. Mechanical or functional blockage causing pain, vomiting, distension and reduced passage of stool or flatus. D. A rapidly progressive infection causing fascial and tissue necrosis and requiring urgent surgery.