Some hens are birds

By John

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: Some 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.

Answer: Option C