If the statement 'Some plants are carnivorous' is given as true, then which of the following could be immediately inferred from it?

1.'All plants are carnivorous' is undetermined

2.'All plants are carnivorous' is true

3.'Some plants are not carnivorous' is undetermined

4.'No plants are carnivorous' is false

A2, 3 and 4 only

B2 and 3 only

C2 and 4 only

D1, 3 and 4 only ✓ Correct

Correct answer: (D) 1, 3 and 4 only

Explanation

With "Some plants are carnivorous" true, A and O stay undetermined and E is false, giving 1, 3 and 4.

A stands above I as superaltern, so a true I leaves "All plants are carnivorous" undetermined.

I and O are subcontraries, so a true I leaves "Some plants are not carnivorous" undetermined.

I and E are contradictories, so a true I makes "No plants are carnivorous" false.

Thus A undetermined, O undetermined and E false are the secured results.

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