Option D is correct. This is because, placenta establishes an intimate connection between the embryo and the mother. This connects the placenta to transfer food,water and oxygen from mother to the embryo or foetus

The placenta supplies food and nutrients to the fetus, not the umbilical cord. The placenta is the organ that develops in the uterus during pregnancy and attaches to the uterine wall, providing the fetus with oxygen and nutrients through the umbilical cord. The umbilical cord is the structure that physically connects the fetus to the placenta.