Final answer:
Lithotripsy is the medical procedure that uses acoustic waves to crush kidney stones into smaller fragments that can be more easily passed through the urinary tract.Thus the correct option is a.
Step-by-step explanation:
The procedure that involves crushing of kidney stones using acoustics followed by washing the fragments is called lithotripsy. During this medical procedure, high-intensity ultrasound pulses are applied to fragmentation the kidney stones into small pieces that can then easily pass through the urinary tract. If a kidney stone becomes too large to pass naturally and starts to block the ureter, causing severe pain or discomfort, lithotripsy provides a non-invasive solution to break down the stone, although there is a risk that it can cause damage to the kidneys.