Choose the correct word for a sudden, violent, and illegal seizure of power :

A coup (often called coup d’état) means a sudden, illegal, and often violent overthrow of a government or seizure of power. (Hindi meaning: तख्तापलट)

The key ideas in the question are: sudden, violent, and illegal seizure of power, which directly matches coup.

Example:

The army led a coup and took control of the country overnight.

Why other options are not the best match:

Option (a) Mutiny: Revolt by soldiers/sailors against authority (Hindi meaning: विद्रोह / बगावत), not necessarily a complete seizure of state power.

Option (b) Rebellion: General resistance against authority/government (Hindi meaning: बगावत), can be prolonged and not always sudden takeover.

Option (c) Insurrection: A violent uprising against authority (Hindi meaning: सशस्त्र विद्रोह), but it is broader; a coup specifically targets seizure of governmental power.

So the correct answer is (d)