Correct Option: C

Marion Jones won five medals at the 2000 Summer Olympics in Sydney, Australia, but forfeited all medals and prizes dating back to September 2000 after her October 2007 admission that she took performance-enhancing drugs as far back as the 2000 Summer Olympics, and that she had lied about it to a grand jury investigating performance-enhancer creations by Victor Conte and the Bay Area Laboratory Co-operative (BALCO). On December 12, 2007, the International Olympic Committee formally stripped Jones of all five Olympic medals dating back to September 2000, and banned her from attending the 2008 Summer Olympics in any capacity.
Note : As of August 13, 2016, American swimmer Michael Phelps has won the most Olympic medals with 28 medals (23 gold, 3 silver, 2 bronze). He is also the most decorated Olympian in individual events, with 16 medals (13 gold, 2 silver, 1 bronze)