The correct answer is (a) Shital Tomar.
Shital Tomar is an Indian freestyle wrestler who won the gold medal in the 55 kg category at the 2014 Commonwealth Games. She has also won gold medals at the 2013 Asian Wrestling Championships, the 2014 Asian Games, and the 2015 World Wrestling Championships.
Gargi Yadav is an Indian freestyle wrestler who won the bronze medal in the 55 kg category at the 2014 Commonwealth Games. She has also won bronze medals at the 2013 Asian Wrestling Championships and the 2014 Asian Games.
Alka Tomar is an Indian freestyle wrestler who won the silver medal in the 55 kg category at the 2014 Commonwealth Games. She has also won silver medals at the 2013 Asian Wrestling Championships and the 2014 Asian Games.
Poonam Yadav is an Indian freestyle wrestler who won the bronze medal in the 55 kg category at the 2014 Asian Games. She has also won bronze medals at the 2013 Asian Wrestling Championships and the 2015 World Wrestling Championships.
Shital Tomar is the most successful of these wrestlers, having won more gold medals than the others. She is also the only one of these wrestlers to have won a world championship.