Explanation:

- The Moon orbits the Earth in roughly 27.3 days, known as its sidereal period. This is the time it takes for the Moon to return to the same position among the stars. This explains Option:3 - 27 days.

- Option:1 - 30 days: This is close to the Moon's synodic period, which is about 29.5 days, representing the time between full moons. Incorrect in the context of orbital movement.

- Option:2 - 24 days: Incorrect. This timeframe does not correspond to any significant lunar cycle.

- Option:4 - 29 days: Close to the synodic period, but not the orbital period.