In order to win the Grand Slam in Tennis, a player must win which one of the following groups of tournaments ?

• A. Australian Open, Wimbledon, French Open, U.S. Open
• B. Wimbledon, French Open, U.S. Open, Swedish Open
• C. Wimbledon, French Open, Paegas Czec Open, U.S. Open
• D. Davis Cup, Wimbledon, French Open, Australian Open