The glomerular filtration rate (GFR) is a measure of how well the kidneys are filtering the blood and removing waste products. A high GFR means that the kidneys are working too fast and may not be able to reabsorb enough water and nutrients from the urine. This can lead to a high urine output, which is also called polyuria. Therefore, the correct answer to your question is A. urine output will be high.
Some of the possible causes of a high GFR include diabetes, high blood pressure, kidney infection, kidney stones, or certain medications. A high GFR can also result in a low blood volume, dehydration, electrolyte imbalance, and kidney damage. If you have a high GFR, you should consult your doctor for further evaluation and treatment.