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Forestland is a planet inhabited by different kinds of creatures. Among other creatures, it is populated by animals all of whom are ferocious. There are also creatures that have claws, and some that do not. All creatures that have claws are ferocious.

Based only on the information provided above, which one of the following options can be logically inferred with certainty?

  • A.All creatures with claws are animals.
  • B.Some creatures with claws are non-ferocious.
  • C.Some non-ferocious creatures have claws.
  • D.Some ferocious creatures are creatures with claws.

Answer: D

The certain inference is Some ferocious creatures are creatures with claws.

The passage says creatures with claws exist ('there are also creatures that have claws') and that all of them are ferocious. So at least one ferocious creature has claws, which is exactly the statement.

'All creatures with claws are animals' does not follow: we know animals are ferocious and clawed creatures are ferocious, but nothing says the clawed creatures are animals. 'Some creatures with claws are non-ferocious' and 'some non-ferocious creatures have claws' both contradict the rule that every clawed creature is ferocious.

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