In a lottery ,a person choose six,different natural numbers at random from 1 to 20 and if these six numbers match with the six numbers already fixed by lottery committee,he wins the prize.What is the probability of winning the prize in the game ?[Hint : Order of the numbers is not important]

Question

$\begin{array}{1 1}(A)\;\large\frac{1}{38760}\\(B)\;\large\frac{1}{28760}\\(C)\;\large\frac{1}{18760}\\(D)\;\text{None of these}\end{array} $