The correct answer is: Serena Williams.
Serena Williams won the Women’s Singles event at Wimbledon 2018, defeating Angelique Kerber in the final. This was Williams’ 7th Wimbledon title and her 24th Grand Slam title overall, tying Margaret Court for the most Grand Slam titles in the Open Era.
Venus Williams is a former world No. 1 tennis player. She has won seven Grand Slam singles titles, five Wimbledon titles, and four Olympic gold medals.
Simona Halep is a Romanian professional tennis player. She has won one Grand Slam singles title, the 2018 French Open. She has also reached the final of the 2014 French Open, 2017 US Open, and 2019 Wimbledon.
Angelique Kerber is a German professional tennis player. She has won three Grand Slam singles titles, the 2016 Australian Open, 2016 US Open, and 2018 Wimbledon. She has also reached the final of the 2018 French Open.