<prompt>  Forty eight hours after sustaining a blunt abdominal injury, a 15 year old boy presents with hematuria and pain in the left side of abdomen. On examination, he has a pulse rate of 96 minute with a BP of 11070 mmHg. His Hb is 10-8 gm with a PCV of 31. Abdominal examination revealed tenderness in left lumbar region but no palpable mass. The most appropriate investigation to diagnose and find the extent of renal injury would be-Sonographic evaluation of abdomenIntravenous pyelographyContrast enhanced computed tomographyMR urography 