Fact 1: Eyeglass frames cost between $35 and $350.<br>Fact 2: Some eyeglass frames are made of titanium.<br>Fact 3: Some eyeglass frames are made of plastic.<br><br>If the first three statements are facts, which of the following statements must also be a fact?<br>I: Titanium eyeglass frames cost more than plastic frames.<br>II: Expensive eyeglass frames last longer than cheap frames.<br>III: Only a few eyeglass frames cost less than $35.

Correct Answer: None of the statements is a known fact.
There is no information in the facts to support statements I or II. Statement III is clearly wrong because, according to Fact 1, no frames cost less than $35.