The _ is responsible for removing waste products from the blood.

A. urethra
B. urinary bladder
C. kidney
D. ureters

C. kidney

The correct answer is C. kidney.

The kidney is responsible for removing waste products from the blood. To arrive at this answer, you can go through the process of elimination by understanding the role and function of each given option:

A. Urethra: The urethra is a tube that allows urine to exit the body, but it is not responsible for removing waste products from the blood.

B. Urinary bladder: The urinary bladder is a muscular sac that stores urine until it is ready to be released, but it does not remove waste products from the blood.

D. Ureters: The ureters are tubes that transport urine from the kidneys to the urinary bladder, but they do not remove waste products from the blood.

By eliminating options A, B, and D, the remaining option C, kidney, is the correct answer.