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?
Fact 1: All chickens are birds.
Fact 2: Some chickens are hens.
Fact 3: Female birds lay eggs.
A fact must be PROVABLE – no guess work.
None of the statements here is a fact.
Correct option: D
In normal case there will be some(at least one) chicken that are not hens.
But in extreme case “Fact 2: Some chickens are hens” will be all chickens are hens.