Why a body weighs less at the equator than at the poles?

Consider the following statements: A body weighs less at the equator then at the poles because: 1. earth rotates about its axis. 2. the ice cap at the poles increases gravitational pull. equatorial diameter is greater than the polar diameter. of some unknown facts. Which of the statements given above is/are incorrect?

Where is the weight of a body greater -at the equator or at the poles ?

Where does a body weigh less? At the sea level or on the mountains?

Where does a body weigh more at the pole or at the equator?

The weight of a body is less inside the earth than on the surface. Why?

Where does a body weight more at the pole or at the equator ?