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Statement -

A. Some drugs are illegal. Marble is illegal. Marble is a drug.

B. All wolves are dogs. Some dogs are birds. Some wolves are dogs.

C. All locks are keys. Some keys do not open. Some locks do not open.

  • A.A
  • B.B
  • C.C
  • D.None

Answer: D

Correct answer: None

In A the middle term “illegal” is undistributed: some drugs are illegal and marble is illegal, which does not make marble a drug. In B the third segment follows from the first premise alone, so it is not deduced from both. In C, “some keys do not open” need not touch the locks at all. None of the three qualifies.

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