A. Option 5 20 mmHg. This is similar to the pressure drop along systemic capillaries when pressure at the arteriolar end is 35 mmHg and that at the venous end is 15 mmHg.
B. Option 5 20 mmHg. This would represent the situation at the proximal ends of the glomerular capillaries; further along the capillaries, their hydrostatic pressure falls, while the oncotic pressure rises as protein-poor fluid is filtered; both factors reduce the filtration pressure.
C. Option 2 5 mmHg. This would represent the situation in a patient with serious hypotension (due, for example, to haemorrhage), just before filtration pressure dropped to zero when no further urine could be formed (anuria).
D. Option 5 20 mmHg. With this capillary pressure, filtration would not occur; without any flow, capsular pressure would fall to near zero.
E. Option 1 0 mmHg. Like capillaries, nephrons need a pressure drop along them to permit flow distally.