Explanation:

- Option 1: One

- This option is incorrect. An umbilical cord does not contain a single artery.

- Option 2: Two

- Correct Answer

- The umbilical cord typically contains two arteries and one vein. The arteries carry deoxygenated blood from the fetus to the placenta.

- Option 3: Four

- This option is incorrect. There are not four arteries in an umbilical cord.

- Option 4: Three

- This option is partially correct in terms of total vessels. While an umbilical cord has three vessels, only two are arteries. The third is a vein.

Option 2: Two is correct.