Government by a few persons :

Autocracy: government by a single person or small group that has unlimited power or authority

Oligarchy: a small group of people having control of a country or organization.

Anarchy: state of a society being freely constituted without authorities or a governing body.

Bureaucracy: a system of government in which most of the important decisions are taken by state officials rather than by elected representatives.

Hence, the correct answer is option B.