How to increase reabsorption of iso-osmolar fluid from glomerular filterate?

Ans. is 'd' i.e., Increased filtered load(Ref: Principles of medical physiology p.786]Glomerulotubular balance refers to the fact that the total rate of reabsorption increases as the filtered load increases, even though the percentage of GFR reabsorbed in the proximal tubules remains relatively constant about 65%