A sphere of solid material of specific gravity 8 has a concentric spherical cavity and just sink...

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A sphere of solid material of specific gravity 8 has a concentric spherical cavity and just sinks in water. Then, the ratio of the radius of the cavity to the outer radius of the sphere must be
(a) \( \frac{\sqrt[3]{3}}{2} \)
(b) \( \frac{\sqrt[3]{5}}{2} \)
(c) \( \frac{\sqrt[3]{7}}{2} \)
(d) \( \frac{2}{\sqrt[3]{7}} \)
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