The volume of right circular cone, whose radius of the base is one-third of its altitude, and the volume of a hemisphere are equal. The ratio of the radii of the cone and the hemisphere is;

• A. \(\sqrt[3]{3}\;:\;\sqrt[3]{2}\)
• B. 2 : 3
• C. \(\sqrt[3]{2}\;:1\)
• D. \(\sqrt[3]{2}\;:\;\sqrt[3]{3}\)