The correct answer is option 1: Rotation.

Rotation refers to the Earth`s spinning motion around its axis. The Earth takes approximately 24 hours to complete one full rotation. As the Earth rotates, different parts of the planet are exposed to the Sun`s light, causing day and night. When a particular location on Earth is facing towards the Sun, it experiences daylight, while the opposite side is in darkness, creating nighttime.

Option 2 (Revolution) refers to the Earth`s orbit around the Sun, which takes approximately 365.25 days. However, this orbital motion does not directly cause the day and night cycle, but it does affect the variation of daylight hours throughout the year.

Option 3 (Rotation and Revolution both) is incorrect as revolution alone does not cause the day and night pattern.

Option 4 (None of these) is also incorrect as rotation is the main cause of the day and night cycle.