The correct answer is: B. Steffi Graf.
Steffi Graf won the Grand Slam title four times successively in 1988, 1989, 1990, and 1991. She is the only player in history to have won all four Grand Slam singles titles in a single year twice. She is also the only player to have won the Golden Slam, which consists of all four Grand Slam singles titles and the Olympic gold medal in the same year.
Mortina Navratilova is a former professional tennis player who won 18 Grand Slam singles titles. She is the second most successful female tennis player of all time, behind Margaret Court.
Jennifer Capriati is a former professional tennis player who won three Grand Slam singles titles. She is the youngest player to ever win a Grand Slam singles title, at the age of 16.
Monica Seles is a former professional tennis player who won nine Grand Slam singles titles. She was the world number one player for a total of 377 weeks, which is the second most of all time.
In conclusion, the correct answer is: B. Steffi Graf.