Fact 1: Robert has four vehicles. Fact 2: Two of the vehicles are red. Fact 3: One of the vehicles is a minivan.
If the first three statements are facts, which of the following statements must also be a fact? I. Robert has a red minivan. II. Robert has three cars. III. Robert's favorite color is red.
I. I only
II. 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. 仅 II, B. 仅 IV, C. 仅 III, D. 以上各项均不成立
Answer: B
True statement: IV