What is a "claim of fact"?

Responses

A claim that can be proven or verified by observation or research.
A claim that can be proven or verified by observation or research.

A claim that can be proven by the author's opinion.
A claim that can be proven by the author's opinion.

A claim that can be proven by emotion and personal experience.
A claim that can be proven by emotion and personal experience.

A claim that can be proven by the author's background and credibility

A claim that can be proven by the author's background and credibility.