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:

 Key PointsSquare of opposition:

• The square of opposition is a chart that was introduced within classical (categorical) logic to represent the logical relationships holding between certain propositions in virtue of their form.
• The following categories are driven from Square of the opposition chart:
  • Universals on top v particulars on the bottom
  • Affirmatives on left v negatives on right · Contradictories (diagonals) always have the opposite truth values--you will always be able to determine the truth value of contradictories.
  • Contraries cannot both be true at the same time
  • Sub-contraries are exactly the opposite of contraries.
    • It is always the case that at least one is true.
    • If you know that one is false, then you automatically know that the other is true. (They can however both be true simultaneously.)

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• 'If we see the above picture we can analyze the following Comes under subcontrary.
  • Some nurses are caring human beings.
  • Some nurses are not caring about human beings.

Therefore, we conclude that the correct answer is C and D only.