Which of the following is/are true:
1.The conversion of an O proposition is valid.
2.The conversion of an A proposition is an A proposition.
3.The conversion of an E proposition is conversion by limitation.
4.The conversion of an I proposition is valid.
A1 & 4 only
B1 & 2 only
C3 only
D4 only ✓ Correct
Correct answer: (D) 4 only
Explanation
Only the claim that the conversion of an I proposition is valid holds true.
Some S are P converts simply to some P are S, both being particular affirmatives, so the conversion is sound.
An O proposition cannot be converted at all, so its conversion is not valid.
An A proposition converts only by limitation into an I proposition, not into another A.
An E proposition converts simply into an E, so its conversion is not conversion by limitation.
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