The Disadvantage of Batch Fermentations, as Opposed to Continuous Feed

The disadvantage of batch fermentations, as opposed to continuous feed systems, is that _______.

A) the end product is not as pure as the product made by the continuous feed process
B) new substrate must be added to the fermentor continuously for the fermentation to continue
C) it is small scale production of a product
D) there is a limit to the amount of product formed since all materials are added to the fermentor at the beginning