Explanation:

Correct Option 2: Benefactor
The word "Tyrant" refers to:

A cruel and oppressive ruler, someone who exercises power unjustly or harshly.

Let's evaluate the options:

Patron – A supporter, especially one who gives financial or other support. Not an exact opposite of tyrant.

Benefactor – A person who gives help, especially financial aid, to others. Implies kindness and generosity.

Champion – A defender or advocate of a cause or person. Positive, but not necessarily an opposite of tyrant.

Rival – A competitor; not opposite in moral character or ruling style.

Correct Antonym:

2. Benefactor – Because a benefactor helps and supports others, opposite to a tyrant who oppresses.