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The question has a set of four statements. Each statement has three segments. Choose the alternative where the third segment in the statement can be logically deduced using both the preceding two, but not just from one of them.

1. All mammals are viviparous. Some fish are viviparous. Some fish are mammals.
2. All birds are oviparous. Some fish are not oviparous. Some fish are birds.
3. No mammal is oviparous. Some creatures are oviparous and some are not. Some creatures are not mammals.
4. Some creatures are mammals. Some creatures are viviparous. Some mammals are viviparous.
1. A only
2. B only
3. C only
4. D only

Mammal and oviparous are disjoint set . so $\text{2nd}$ statement in $\text{option c}$ is "some creatures are oviparous and some are not" so definitely some creatures are not mammal (because they are oviparous).

Answer$:\text{C}$
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