The correct option is B Zonary
The placenta is an organ that links the evolving fetus to the uterine wall to assist in nutrient uptake, thermo-regulation, waste elimination, and gas exchange and to support a pregnancy. In carnivores like cats, dogs, the zonary placenta is found. In this, placenta forms a complete band or ring of tissue on the chorion. Thus, the correct answer is ‘Zonary'.