Fermentation Is an Ancient Process Utilized by Egyptians and Other

Fermentation is an ancient process utilized by Egyptians and other civilizations to provide safer beverages to drink. On the molecular level, why would fermentation make fluids safer to drink?

A) The presence of ethanol in the beverages would kill of many pathogens that might be present.
B) The lactic acid in the beverages would make the drinks too acidic for most bacterial cells.
C) The Acetaldehyde would kill many of the pathogens present.
D) The recycling of NAD⁺ would increase electron and H⁺ ion concentrations, thus making the beverages acidic enough to inhibit bacterial growth.