Fact 1: All chickens are birds.
Fact 2: Some chickens are hens.
Fact 3: Female birds lay eggs.
- All birds lay eggs: Fact 3 says that female birds lay eggs. But we have no idea about male birds. So, this statement is not a fact,
- Hens are birds. Fact 1 and 2 says that some birds (which are chicken) are hens. But it does not say that hens (by default “all” applies here) are birds.
- Some chickens are not hens. Fact 2 says that some chickens are hens. But this does not prove “some chickens are not hens” – that may or may not be true. If Fact 2 is written as “Not all chickens are hens” then this statement will be a fact.
A fact must be PROVABLE – no guess work.
None of the statements here is a fact.
Correct option: D