Final answer:
The probable cause of acute glomerulonephritis in the 5-year-old boy is a history of a sore throat 2 weeks ago.
Step-by-step explanation:
The nurse recognizes the probable cause of acute glomerulonephritis in the 5-year-old boy as a history of a sore throat 2 weeks ago. Acute glomerulonephritis can develop following a streptococcal throat infection. Streptococcal antigens and antibodies form immune complexes that deposit in the glomeruli of the kidneys, leading to inflammation and damage.