The units of moment of inertia of an area are A. kg/m B. kg/m2 C. m4 D. m3

The correct answer is C. m4.

Moment of inertia is a measure of how difficult it is to change the rotation of an object. It is calculated by multiplying the mass of an object by the square of its distance from the axis of rotation. The units of moment of inertia are therefore kg m2.

Option A is incorrect because it does not include the square of the distance from the axis of rotation. Option B is incorrect because it does not include the mass of the object. Option D is incorrect because it is the volume of an object, not the moment of inertia.