Which of the following is/are true: A. The conversion of an O proposition is…

In categorical logic, conversion involves swapping the subject and predicate terms. 1. A Proposition (All S are P): Converts by limitation to an I proposition (Some P are S). Thus, statement B is false. 2. E Proposition (No S are P): Converts simply to another E proposition (No P are S). Thus, statement C is false. 3. I Proposition (Some S are P): Converts simply to another I proposition (Some P are S). This conversion is valid. Thus, statement D is true. 4. O Proposition (Some S are not P): Conversion is invalid because the predicate of an O proposition is undistributed, but becomes distributed in the converse. Thus, statement A is false. Therefore, only statement D is correct.