Given these structures: major calyx, minor calyx, renal pelvis, ureter, choose the arrangement that lists the structures in order as urine leaves the collecting ducts and travels to the bladder.
a) 3, 2, 1, 4
b) 1, 2, 3, 4
c) 2, 1, 3, 4
d) 3, 4, 2, 1