Given That Limits of Alcohol Production Through Fermentation,an Alcohol Drink

Given that limits of alcohol production through fermentation,an alcohol drink with 50% alcohol must have been produced through:

A) increasing the volume of water adding to the fermentation process.
B) using a fortified yeast to increase the production of alcohol.
C) using a distillation process to concentrate alcohol produced from fermentation.
D) adding fresh yeast to continue the production of alcohol.