Correct option is B
The Second moment of area, also known as the moment of inertia of an area, is a measure of how an area is distributed relative to an axis. It is mathematically defined as the product of the area and the square of the distance of the center of gravity of that area from the axis. The second moment of area is crucial in structural engineering for determining the resistance of a cross section to bending and deflection.
The First moment of area is the product of the area and the distance of its centroid from a given axis, but it does not involve squaring the distance.
Mass moment of inertia relates to the distribution of mass relative to an axis and is not the same as the second moment of area.
Second moment of mass is not a standard term in engineering mechanics.
Thus, the correct answer is second moment of area.
