The correct option is
B Cloaca
From the outer border of each kidney in a frog has a fine transparent duct, which is known as ureter in the female and urinogenital duct in the male. They run backward from the kidneys and open into the cloaca, and carry urine from the kidneys to the cloacal chamber. The terminal portion of the alimentary canal is known as cloaca which receives fecal matter, genital products, and urine.
So the correct answer is 'Cloaca'.