Select the option that can be used as a one-word substitute for the given group of words.
"A person who rules with absolute power and authority."

The correct one-word substitute is (a) "Dictator."
Explanation:
· A "Dictator" is a ruler who holds absolute power without democratic limitations.
Other Options:
· (b) "Ruler" – Incorrect, general term for a leader.
· (c) "Senator" – Incorrect, refers to a legislative member.
· (d) "Sovereign" – Incorrect, means a monarch, not necessarily absolute.
Example Sentence:
· "Hitler was a notorious dictator in world history."