Which of the following statements are sub-contraries?
A. All nurses are caring human beings.

B. No nurses are caring human beings.

C. Some nurses are caring human beings.

D. Some nurses are not caring human beings.

Choose the correct answer from the options given below:

Correct option is D

The statements C (Some nurses are caring human beings) and D (Some nurses are not caring human beings) are sub-contraries because both can be true simultaneously, but they cannot both be false at the same time. Sub-contraries are categorical propositions that express particular truths, where the truth of one does not negate the truth of the other. For example, it’s possible that some nurses are caring, while others are not. This makes them sub-contraries, as both are true in certain instances but cannot both be false.
Information Booster: 1. Sub-contraries are statements that can both be true but cannot both be false.
2. Contradictories are statements where one must be true and the other false (e.g., "All S are P" vs. "Some S are not P").
3. Contraries cannot both be true but can both be false (e.g., "All S are P" vs. "No S is P").
4. Sub-alternation involves the relationship between universal and particular propositions (e.g., "All S are P" and "Some S are P").
5. Sub-contraries deal with particular propositions (e.g., "Some S are P" and "Some S are not P").