Determine net pressure driving glomerular filtration

Suppose if the average hydrostatic pressure in glomerular capillaries is 55 mmHg, the hydrostatic pressure in Bowman’s space is 15 mmHg, the average colloid osmotic pressure in the glomerular capillaries is 30 mmHg, and there is no protein in the glomerular ultrafiltrate, what is the net pressure driving glomerular filtration in this example?
A.0 mmHg
B.5 mmHg
C.10 mmHg
D.15 mmHg
E.25 mmHg
F.45 mmHg