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Calculating the moment of inertia

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An object is made up of three masses connected by massless rods of fixed length. Mass A is located at (30.0 cm, 0 cm) and has a mass of 250 grams, mass B is located at (0 cm, 40.0 cm) and has a mass of 350 grams, mass C is located at (-20.0 cm, 0 cm) and has a mass of 450 grams. What is the moment of inertia of this object about an axis perpendicular to the x-y plane and passing through the origin?
0.0965 kg m^2
0.128 kg m^2
0.305 kg m^2
0.152 kg m^2

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This solution provides calculations for finding the moment of inertia.

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