What achievement is attributed to Birte Ove-Petersen at the 1938 European Aquatics Championships?

A. Breaking the world record in the 200m breaststroke
B. Setting a new European record in the 100m backstroke
C. Winning three medals, including a gold in the 4×100m freestyle relay with a new world record
D. Winning three individual gold medals in freestyle events
Answer: 