All birds have wings. An object has the same property. Which statement is correct?
Answer and explanation
Correct answer: D. We cannot tell whether it is one of the birds
- Step 1: The first statement says that all birds have the property, not that only birds have it. Step 2. Other things may share the property, so no conclusion about the group follows. Answer: We cannot tell whether it is one of the birds. Why not the others: It must be one of the birds is what you get if you reverse the statement. It cannot be one of the birds is what you get if you deny without evidence. It is the largest of the birds is what you get if you invent extra facts.
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