6. In the final round of the English League, only 4 teams have a chance to enter the top two and advance, Team A has 22 points, Team B has 22 points, Team C has 21 points, and Team D has 20 points. In the last round, A plays against C, and B plays against D. Assume the probability of each team winning or losing is the same. Let $P_{\mathrm{A}}$, $P_{\mathrm{B}}$, $P_{\mathrm{C}}$, and $P_{\mathrm{D}}$ represent the probability of each team advancing, then which of the following statements is correct ().
A. $P_{\mathrm{C}}>P_{\mathrm{D}}$
B. $P_{\mathrm{C}}=P_{\mathrm{D}}$
C. $P_{\mathrm{A}}>P_{\mathrm{B}}$
D. $P_{\mathrm{A}}<P_{\mathrm{B}}$
6. B
6. It can be known that if Team A and Team B both lose, neither can advance, so their positions are the same; Teams C and D can only advance by winning, so their positions are the same. Therefore, $P_{\mathrm{A}}=P_{\mathrm{B}} \quad P_{\mathrm{C}}=P_{\mathrm{D}}$.