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Answer: (C) Either I or II follows
Explanation
The statements Some fish are frogs and Some frogs are whales do not establish a definite relationship between fish and whales because the middle term frogs is not distributed in either statement.
However, Conclusion I (Some fish are whales) is a particular affirmative proposition (I-type) and Conclusion II (No fish is a whale) is a universal negative proposition (E-type). Since they share the same subject and predicate terms, they form a complementary pair. In any scenario, either fish and whales will have at least one common member, or they will share no members at least. Thus, either Conclusion I or Conclusion II must logically follow.