After being involved in a motor vehicle crash, a 25-year-old man is brought to a hospital that has surgery capabilities available.. Computed tomography of the chest and abdomen shows an aortic injury and splenic laceration with free abdominal fluid. His blood pressure falls to 70 mm Hg after CT. The next step is: Select one: obtain contrast angiography transfer to a higher level trauma center perform an exploratory laparotomy infuse additional crystalloid fluids e. Obtain transesophageal echocardiography a. i b. C. d.