Four 50-G Point Masses Are at the Corners of a Square

Multiple Choice

Four 50-g point masses are at the corners of a square with 20-cm sides.What is the moment of inertia of this system about an axis perpendicular to the plane of the square and passing through its center?

A) 1.0 $\times$ 10^-3 kg · m²
B) 4.0 $\times$ 10^-3 kg · m²
C) 2.0 $\times$ 10^-3 kg · m²
D) 8.0 $\times$ 10^-3 kg · m²
E) 2.8 $\times$ 10^-3 kg · m²