The correct answer is B. Cara Black.
Leander Paes and Cara Black won the US Open Mixed Doubles in 2008. They defeated the American team of Bethanie Mattek-Sands and James Blake in the final. Paes and Black were the top seeds in the tournament. They had a bye in the first round and then defeated the teams of Liezel Huber and Jamie Murray, and Anna-Lena Grönefeld and Mark Knowles in the second and third rounds, respectively. In the quarterfinals, they defeated the team of Victoria Azarenka and Max Mirnyi. In the semifinals, they defeated the team of Samantha Stosur and Scott Lipsky. In the final, they defeated the American team of Bethanie Mattek-Sands and James Blake.
Paes and Black had previously won the US Open Mixed Doubles in 2005. They had also won the Australian Open Mixed Doubles in 2005, 2006, and 2007. They were the first team to win three consecutive Australian Open Mixed Doubles titles.
Paes is an Indian professional tennis player. He is the most successful doubles player in the history of Indian tennis. He has won 18 Grand Slam titles, 10 in men’s doubles and 8 in mixed doubles. He is also the only player to have won a Grand Slam title in all four Grand Slam doubles events.
Black is a Zimbabwean professional tennis player. She is the most successful doubles player in the history of Zimbabwe. She has won 14 Grand Slam titles, 7 in women’s doubles and 7 in mixed doubles. She is also the only player to have won a Grand Slam title in all four Grand Slam doubles events.