The correct answer is: A. 23rd
Serena Williams defeated her sister Venus Williams in the 2017 Australian Open final to win her 23rd Grand Slam singles title. This was her seventh Australian Open title, and her first since 2015.
Venus Williams was the defending champion, but she was unable to defend her title due to a back injury. Serena Williams was the top seed in the tournament, and she cruised through the early rounds. She defeated her sister in the quarterfinals, and then defeated Angelique Kerber in the final.
This was Serena Williams’ 23rd Grand Slam singles title, which is the most in the history of women’s tennis. She is also the only player in history to have won at least seven titles in each of the four Grand Slam tournaments.
Here is a brief explanation of each option:
- Option A: 23rd. This is the correct answer. Serena Williams won her 23rd Grand Slam singles title at the 2017 Australian Open.
- Option B: 18th. This is the number of Grand Slam singles titles that Serena Williams had won before the 2017 Australian Open.
- Option C: 26th. This is the number of Grand Slam singles titles that Margaret Court has won. She is the all-time leader in Grand Slam singles titles.
- Option D: 20th. This is the number of Grand Slam singles titles that Steffi Graf has won. She is the second all-time leader in Grand Slam singles titles.