(−)−Fenchone can be purchased in 70% optical purity. What ratio of enantiomers is present?...

(−)−Fenchone can be purchased in 70% optical purity. What ratio of enantiomers is present?

A) 70% (−) : 30% (+)

C) 55% (−) : 45% (+)

B) 85% (−) : 15% (+)

D) 60% (−) : 40% (+)