6. In the final stage of a professional bowling tournament, the top five players compete as follows: First, the fifth and fourth place players compete, the loser gets the 5th prize; the winner competes with the third place player, the loser gets the 4th prize; the winner competes with the second place player, the loser gets the 3rd prize; the winner competes with the first place player, the loser gets the 2nd prize, the winner gets the 1st prize. The number of different prize-winning sequences is
A. 10
B. 16
C. 24
D. 120
6. B Let the top five be $A, B, C, D, E$; then the ways for $D, E$ to compete for the 5th place are 2; the winner of $D, E$ and $C$ to compete for the 4th place also have 2 ways; the winner among them and $B$ to compete for the 3rd place have 2 ways; finally, the winner of the first three rounds and $A$ to compete for the 2nd and 1st place also have 2 ways.
Therefore, the total number of ways is $2 \cdot 2 \cdot 2 \cdot 2=2^{4}=16$. Hence, the answer is B.