Fact 1: All chickens are birds. Fact 2: Some chickens are hens. Fact 3: Female birds lay eggs. If the first three statements are facts, which of the following statements must also be a fact? I: All birds lay eggs. II: Hens are birds. III: Some chickens are not hens.
A. I only B. II only C. II and III only D. None of the statements is a known fact.
Correct Answer: C
Explanation
From Fact 1 and Fact 2, we know that hens are a type of chicken, so they are birds. Also, since some chickens are hens (Fact 2), it implies that some chickens are not hens. So, both II and III must be true.
