How does filtration occur during the formation of urine?

a.
pressure causes water and dissolved substances to filter through capillary walls of the glomerulus.
b.
nephron tubes filter waste products and transfer them into the collecting tubules.
c.
gravity forces large particles to filter through capillary walls of the glomerulus.
d.
bowman's capsules collect dissolved substances and transfer them to the peritubular capillaries.