Which American tennis player, born in 1943, won 39 Grand Slam titles (18 singles, 14 doubles, 7 mixed) and was a pioneer for LGBTQ+ athletes by coming out publicly in 1981?

• A Martina Navratilova
• B Chris Evert
• C Billie Jean King ✓
• D Serena Williams

Billie Jean King founded the WTA, defeated Bobby Riggs in the 'Battle of the Sexes', and was awarded the Presidential Medal of Freedom for her advocacy for gender equality and LGBTQ+ rights.