
An excess of K produces, oliguria first and then anury.
Intestinal cramps and diarrhea.
It is an eight year old child, therefore there is chest enough size to take an ECG. T waves too tall will demonstrate a serum K level beyond 5,6 mEq/liter. Besides the child must be dehydrated because the gastroenteritis, it is logical to think in K depletion.
A D5% in W 500 cc + 6 cc Na20%cl + 3 cc Kcl is our local IV therapy protocol for children dehydration.
Potassium is the principal intracellular and muscle cation. Its excess or defect lead to heart failure.
Answer B sounds to be most logical.