Fact 1: Some pens don't write. Fact 2: All blue pens write. Fact 3: Some writing utensils are pens.
If the first three statements are facts, which of the following statements must also be a fact? I. Some writing utensils don't write. II. Some writing utensils are blue. III. Some blue writing utensils don't write.
I. II only
II. I and II only
III. II and III only
IV. None of the statements is a known fact.
Question: 以下哪项是正确的？
Options:
A. II 为真, B. 以上各项均不成立, C. 仅 III, D. 仅 I
Answer: A