The correct answer is Due to variation in centrifugal force of earth with latitude. Explanation & Key Takeaways: • The centrifugal force on Earth is caused by its rotation and is strongest at the equator due to the higher rotational velocity. • At the poles, the centrifugal force is negligible as the poles do not experience the same rotational velocity as the equator. • Less centrifugal force at the poles reduces the outward "push," causing a person to weigh more compared to their weight at the equator. • Earth’s shape, which is slightly oblate (flattened at the poles and bulging at the equator), also contributes to the variation in weight. • The gravitational force is slightly stronger at the poles due to the reduced distance from the Earth’s center compared to the equator. Related Concepts: • Centrifugal Force: A pseudo-force that acts outward on a mass when it is rotating, proportional to the rotational velocity and the radius of rotation. • Earth’s Shape: The Earth is an oblate spheroid; it is flatter at the poles and bulges at the equator, influencing gravity and centrifugal forces. • Gravity is slightly stronger at the poles because they are closer to the Earth’s center compared to the equator. • Weight vs Mass: Weight is the force exerted due to gravity and varies with location, while mass remains constant regardless of location. • Rotational Impact: Earth’s rotation affects the distribution of centrifugal force, which contributes to the difference in apparent weight across latitudes.