Identify the group from the following which has organism with a single chromosome and cell division that occurs through fission or budding?

Concept: Prokaryotes contain a single chromosome and cell division occurs through fission or budding. 

The usual method of prokaryote cell division is termed binary fission. 

The prokaryotic chromosome is a single DNA molecule that first replicates, then attaches each copy to a different part of the cell membrane.

Hence, the correct option is option 2.