Both Beggiatoa and the Purple Sulfur Bacteria Use H?S

Multiple Choice

Both Beggiatoa and the purple sulfur bacteria use H?S. These bacteria differ because Beggiatoa

A) Belongs to the gammaproteobacteria
B) Uses H₂S for an energy source.
C) Uses light energy.
D) Is a heterotroph.
E) Uses H₂S for a carbon source.