The Disadvantage of Batch Fermentations,as Opposed to Continuous Feed Systems,is

The disadvantage of batch fermentations,as opposed to continuous feed systems,is:

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