Marjorie Gestring Marjorie Gestring was a springboard  diver from the United States who won the gold medal in 3-meter springboard diving at the 1936 Summer Olympics in Berlin, Germany at the age of 13 years. With the cancellation  of the Olympics in 1940 and 1944 because of World War II, Gestring did not get a chance to defend her title, and her comeback attempt for the 1948 Summer Olympics failed.  Bob Mathias 17-year-old American Bob Mathias won the decathlon  only four months after taking up the sport. He is the youngest athlete in Olympic history to win a men's track and field event. By the time Mathias retired from decathlon competition in 1952, he had nine victories in nine competitions. He had won two gold medals separately in 1948 and 1952. In 1954 a film about his early life called The Bob Mathias Story was made, in which he and his wife played themselves. Fu Mingxia Fu Mingxia was born on August 16, 1978 in Wuhan, Hubei Province. At an early age, her father taught her to swim at a nearby river. She started exercising gymnastics at age 5, soon turning to diving. Fu Mingxia left home at age 9 to train in Beijing. In the 1992 Summer Olympics held in Barcelona, Fu Mingxia became China's youngest Olympic champion ever when she won the 10-meter platform gold at the age of 13. Ian Thorpe Ian Thorpe was born on 13 October, 1982. He is a former Australian freestyle swimmer. At the age of 14, he became the youngest male ever to represent Australia. Ian Thorpe, 17 years old, won the gold medal in the 400m freestyle by breaking his own world record in Sydney 2000. He has won five Olympic gold medals. According to the passage, the youngest athlete who won the most Olympic gold medals came from   _  .
Australia America China Germany