Correct Answer: Omniscient

Solution : The correct choice is the first option.

Explanation : The phrase one who knows all things suggests a person with comprehensive and unlimited knowledge. The term that precisely conveys this meaning is omniscient , which is an adjective that describes someone or something with complete knowledge or awareness of all things.

The meanings of the other options is as follows:

• Omnipotent : This word refers to having unlimited power or authority.
• Oligarchy : This word refers to a form of government or power structure in which a small group of people holds control.
• Ostracise : This word means to exclude or banish someone from a group, often due to social or political reasons.