The correct option is B Oscillatoria
Hormogonia is a part of a filament of a cyanobacterium that detaches and grows by cell division into a new filament. Cyanobacteria mostly multiply by asexual means like binary fission, small fragments (hormogones), hormospores, akinetes, endospores, etc. Common cyanobacteria are-Nostoc, Anabaena, Oscillatoria, etc.