Which of the following statements are so related that they can neither both be true nor can they both be false together?

1.No saints are materialists

2.All saints are materialists

3.Some saints are not materialists

4.Some saints are materialists

A1 & 3 only

B2 & 4 only

C1 & 4 only ✓ Correct

D3 & 4 only

Correct answer: (C) 1 & 4 only

Explanation

Statements 1 and 4 can neither both be true nor both be false, being contradictories.

Statement 1, no saints are materialists, is the E form.

Statement 4, some saints are materialists, is the I form.

E and I stand as contradictories on the square of opposition.

Contradictories always take opposite truth values, never agreeing.

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