Two planets \( A \) and \( B \) of equal mass are having their period of revolutions \( T _{ A } \) and \( T _{ B } \) such that \( T_{A}=2 T_{B} \). These planets are revolving in the circular orbits of radii \( r _{ A } \) and \( r _{ B } \) respectively. Which out of the following would be the correct relationship of their orbits?
(A) \( 2 R_{ A }^{2}= R _{ B }^{2} \)
(B) \( R _{ A }^{3}=2 R _{ B }^{3} \)
(C) \( R_{ A }^{3}=3 R_{ B }^{3} \)
(D) \({R_A}^3 = {4 R_B}^3\)