70.
The answer is: D
Explanation
The correct answer is D: Pete Sampras.
Roger Federer won his 14th Grand Slam title by defeating Robin Soderling in the 2009 French Open final, which was his first and only title at Roland Garros. By doing so, he equaled Pete Sampras's record of 14 Grand Slam titles, which was the most in men's tennis history at that time. He also completed the career Grand Slam, meaning he had won all four major tournaments at least once. Federer later surpassed Sampras's record by winning his 15th Grand Slam title at Wimbledon in 2009.