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Three particles, each of mass \( m \) gram, are situated at the vertices of an equilateral triangle \( A B C \) of side \( / \mathrm{cm} \) as shown in Fig. 7(CF).3. The moment of inertia of the system about a line \( A X \) perpendicular to \( A B \) and in the plane \( A B C \), in gram- \( \mathrm{cm}^{2} \) will be
(A) \( \left.\frac{5}{4} m\right|^{2} \)
(B) \( \left.\frac{3}{2} m\right|^{2} \)
(C) \( \frac{3}{4} m l^{2} \)
(D) \( 2 m l^{2} \)
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