The correct answer is B. Virginia Thrasher. She was 16 years old when she won the gold medal in the 10-meter air rifle event at the 2016 Summer Olympics in Rio de Janeiro.
Deepa Karmakar was 22 years old when she competed in the vault event at the 2016 Summer Olympics. Gaurika Singh was 15 years old when she competed in the 100-meter freestyle event at the 2016 Summer Olympics. Emily Seebohn was 21 years old when she competed in the 100-meter backstroke event at the 2016 Summer Olympics.
Virginia Thrasher was born on January 13, 1998, in Springfield, Virginia. She started shooting when she was 10 years old. She won the gold medal in the 10-meter air rifle event at the 2016 Summer Olympics, becoming the youngest American to win a gold medal in shooting. She also won the gold medal in the 10-meter air rifle event at the 2015 Pan American Games.