Answer: The correct answer is Magnetism.
Explanation: We are given two samples of iron fillings.
Magnetism: This property remains same for any sample of same element.
Mass: We are given different mass. So, they cannot be same.
Shape: Iron fillings cannot have a definite shape.
Volume: As the density of any element remains same always. As the mass is different, so to have the same density, the volume of two sample will also be different.
Hence, magnetism is the only property that will remain same for the two samples.
