It provides a protective barrier between the mother and the fetus. It keeps the fetus inside the mother until birth. It provides a navel when the baby is born. It supplies oxygen and nutrients to the fetus.
I gave my students this multiple choice question: Which statement describes how the umbilical cord supports a developing fetus?

Only one answer is correct among these 4 choices:
- It provides a protective barrier between the mother and the fetus.
- It keeps the fetus inside the mother until birth.
- It provides a navel when the baby is born.
- It supplies oxygen and nutrients to the fetus.

Could you tell me which one is correct?

It supplies oxygen and nutrients to the fetus.