The moment of inertia of a given rectangular area is minimum about-A-its longer centroidal axisB-its polar axisC-its axis along the diagonalD-its shorter centroidal axis-D-its shorter centroidal axis

D its shorter centroidal axis It will be a longer centroidal axis. This is because MI = sum of mass elements with their distance squares. Distance squares sum will be minimum if the axis of rotation/reference is taken as LONGER centroidal axis.