An implicit detail refers to something that is suggested, but never really said. In this case, Emily doesn't know what caused the pink blotches. It would be B because even though it states that he has them, but they don't know why.
Sentence 1: Opinion Sentence 2: Fact Sentence 3: Fact Sentence 4: Fact Sentence 5: Fact Sentence 6: Fact Remember, a fact is a statement that can be proved to be true and opinions are what people think.