A box contain 10 red marbles,20 blue marbles and 30 green marbles.5 marbles are drawn from the box.What is the probability that all will be blue?

Question

$\begin{array}{1 1}(A)\;\large\frac{20C_5}{60C_5}\\(B)\;\large\frac{19C_5}{29C_5}\\(C)\;\large\frac{39C_5}{29C_5}\\(D)\;\large\frac{10C_5}{20C_5}\end{array}$