$A$ box contains $10$ red marbles,$20$ blue marbles,and $30$ green marbles. If $5$ marbles are drawn from the box,what is the probability that all of them will be blue?
- A$\frac{^{20}C_5}{^{60}C_5}$
- B$\frac{^{10}C_5}{^{60}C_5}$
- C$\frac{^{30}C_5}{^{60}C_5}$
- D$\frac{^{20}C_5}{^{60}C_1}$
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