The correct answer is A. Li Na.
Li Na was a Chinese professional tennis player. She was the first Chinese player to win a Grand Slam singles title, winning the 2011 French Open and the 2014 Australian Open. She was also the first Chinese player to reach the No. 1 ranking in the world, which she did in 2014.
Dominika Cibulkova is a Slovak professional tennis player. She has won six singles titles on the WTA Tour, including the 2014 Katowice Open. She has also reached the quarterfinals of the Australian Open (2014), French Open (2012), Wimbledon (2011), and US Open (2015).
Sara Errani is an Italian professional tennis player. She has won five singles titles on the WTA Tour, including the 2012 French Open doubles title with Roberta Vinci. She has also reached the quarterfinals of the Australian Open (2013), French Open (2012), Wimbledon (2013), and US Open (2014).
None of these players won the 2014 Australian Open Women’s Singles title. The winner was Li Na.