A 6-month-old terrier mix is presented with 3 days of vomiting, diarrhea, and lethargy.

Based on the radiograph and ultrasonography image from the abdomen, which one of the following choices is the most likely diagnosis?

A - Splenic torsion
B - Intussusception
C - Renal mass
D - Microhepatica
E - Generalized enteritis