If You've Ever Learned About Beer Making, You May Know

If you've ever learned about beer making, you may know that some people add fruit juice to their yeast mixtures. Why?

A) to facilitate oxidative phosphorylation
B) to provide an additional source of yeast, which will make the beer more potent
C) to provide glucose to the yeast
D) to provide materials for an alternate, aerobic respiration pathway
E) to both facilitate oxidative phosphorylation and to provide an additional source of yeast