The gravitational force of attraction on an object placed at the surface of the earth is known a weight of the object. The weight of the object is different on different planets because it depends on the gravitational constant.
The weight is defined by the Newton's second law as the product between the mass and the gravitational acceleration, that is
W = mg
And its unit in SI is Newton (N) and Lbf in American Unit.
Therefore the option D is the only correct here. 1600 kilo Newton or 1600kN.
