A.I. Explanation:

Option 1: "He has a firm belief that until today no one has been able to replace Rembrandt's art."

Explanation: This option suggests a belief in Rembrandt's irreplaceability, but the text does not explicitly state that no one can replace his art. Instead, it focuses on the misunderstanding and misrepresentation of Rembrandt, rather than a definitive claim about his art being irreplaceable.

Option 2: "He tried to prove that Rembrandt has not been completely understood by the critics."

Explanation: While the text mentions that Rembrandt has been misunderstood, it does not specifically state that the author is trying to prove this to critics. The focus is more on the general public perception and the oscillation of views about Rembrandt rather than a direct challenge to critics.

Option 3: "He tried to portray that even though Rembrandt was highly regarded in the art world, his prowess and mettle was understood by only a few."

Explanation: This option accurately reflects the author's opinion as presented in the text. The author highlights that Rembrandt is often misunderstood and that while he is highly regarded, the true extent of his talent is recognized by only a select few, as indicated by the anecdote about Ruffo's apology.

Option 4: "Rembrandt never believed in self-praise and publicizing, rather he was a silent artist."

Explanation: This option introduces an idea about Rembrandt's character that is not supported by the text. The text does not discuss Rembrandt's personal beliefs about self-praise or publicizing his work; instead, it focuses on the perceptions of his art and the misunderstanding surrounding it.