Select the option that can be used as a one-word substitute for the given group of words.
Government by king or queen

Correct option is A

The correct one-word for the given group of words is (a) Monarchy.
Monarchy: A form of government in which a country is ruled by a king or queen. (राजशाही शासन)
Example: Britain has a constitutional monarchy with a parliamentary system.
Meanings of the given other options:
· (b) Capitalism: An economic system where trade and industries are controlled by private owners (पूंजीवाद)
· (c) Plutocracy: Government by the wealthy (धनाड्यों का शासन)
· (d) Oligarchy: A small group of people having control (अल्पतंत्र)