Two masses \(40 \mathrm{~g}\) and \(60 \mathrm{~g}\) respectively, are attached firmly to the ends of a light metre rule. The centre of gravity of the system is ____________

A. at the mid-point of the metre rule  
B. \(40 \mathrm{~cm}\) from the lighter mass
C. \(40 \mathrm{~cm}\) from the heavier mass
D. \(60 \mathrm{~cm}\) from the heavier mass indeterminate because the metre-rule is light

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Correct Answer: A