Q: In this task, you are given two facts, and a multiple-choice question. Based on the given facts, answer the question with index of the correct option (e.g, "A").
Fact1: measuring the hardness of minerals requires scratching those materials, Fact2: Although a diamond is the hardest substance known to man, it can be chipped or scratched., Question: Measuring the what of minerals requires chipping those materials? (A) deposits (B) potassium (C) size (D) weight (E) hardness (F) shape (G) key element (H) strength
A:
E