Which Action Best Reflects the Movement of Urine from the Renal

Which action best reflects the movement of urine from the renal pelvis to the bladder?

A) Normal intra-abdominal positive pressure promotes renal drainage.
B) Slight distention of the renal pelvis initiates a wave of peristaltic contractions.
C) Distention of the proximal ureter facilitates gravity drainage through signaling channels.
D) Urine is propelled into the bladder when adrenal hormones bind with ureteral receptor sites.