Explanation:

- When assessing a "Mistake of Fact" in legal terms, it usually involves an error about a material fact that affects a contractual agreement.

- An erroneous opinion about the value of a subject matter typically does not qualify as a "Mistake of Fact" because it is often subjective and not related to the actual terms of the contract.

- Option 1: True ? This option claims that an erroneous opinion on value is not a mistake of fact.

- Option 2: Partly True ? This suggests that there might be exceptions, but generally it is not considered a mistake of fact.

- Option 3: False ? This would inaccurately label an opinion as a mistake of fact.

- Option 4: None of the above ? Implies that none of the given options correctly address the statement.

Correct Answer: Option 1: True