Final answer:
A Wilms' tumor is located in the kidney (c) of the urinary system, making the kidney the correct answer for the urinary system structure affected. The urinary bladder is part of the male urinary system but not the reproductive system.
Step-by-step explanation:
A Wilms' tumor is a type of kidney cancer that is commonly found in children and is associated with the kidney, which is part of the urinary system. Therefore, the correct answer to where a Wilms' tumor is located is c) Kidney.
When discussing the structures related only to the male urinary system and not the reproductive system, the correct answer is a) urinary bladder. The urinary bladder is a central part of the urinary system, responsible for storing urine until it is ready to be excreted through the urethra. The urethra in males serves a dual function for both urination and reproduction, which is not the case with the urinary bladder.