A cone is \( 8.4 \mathrm{~cm} \) high and the radius of its base is \( 2.1 \mathrm{~cm} \). It i...

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A cone is \( 8.4 \mathrm{~cm} \) high and the radius of its base is \( 2.1 \mathrm{~cm} \). It is melted and recast into a s. shere. The radius of the sphere is :
(A) \( 4.2 \mathrm{~cm} \)
(B) \( 2.1 \mathrm{~cm} \)
(C) \( 2.4 \mathrm{~cm} \)
(D) \( 1.6 \mathrm{~cm} \)
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