A double star system consists of two stars $A$ and $B$ which have time period $T_A$ and $T_B$. Radius $R_A$ and $R_B$ and mass $M_A$ and $M_B$. Choose the correct option.

• A

  If $T_A>T_B$, then $R_A>R_B$
• B

  If $T_A>T_B$, then $M_A>M_B$
• C

  $\left(\frac{T_A}{T_B}\right)^2=\left(\frac{R_A}{R_B}\right)^3$
• Correct answer
  D

  $T_A=T_B$

Hence, the correct answer is option: 'D'.