Final Answer:
Urethra is the final structure through which urine must travel to empty out of the body. Option: D. is the answer.
Step-by-step explanation:
The correct sequence in the urinary system involves the production of urine in the kidneys, where waste and excess substances are filtered from the blood. The urine then moves through the ureters, which are tubes connecting the kidneys to the bladder. The bladder acts as a temporary storage reservoir for urine until it is ready to be expelled.
The final structure through which urine exits the body is the urethra. The urethra serves as a duct for the passage of urine from the bladder to the external environment. Muscular contractions in the bladder and urethra facilitate the controlled release of urine, a vital process in maintaining the body's fluid and waste balance.
Option: D. Urethra is the answer.