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: All chemical reactions require activation energy to get started., Fact2: Fire is a chemical reaction., Question: What does fire require to get started? (A) an engine (B) activation energy (C) water (D) energy usage (E) direct energy (F) dogs (G) activated almonds (H) adding heat
B

Fact1: Cells are the basic units of the structure and function of living things., Fact2: All cells use glucose for energy., Question: What do all living things use for energy? (A) fish (B) kids (C) energy (D) glucose (E) The Sun (F) procreation (G) sunlight (H) food
D

Fact1: measuring the hardness of minerals requires scratching those materials, Fact2: Carbonate minerals, such as malachite, pearl, and rhodochrosite, are damaged by chemical attack., Question: What is required to measure the hardness of a pearl? (A) lamphreys (B) Playing with it (C) Scratching it (D) keratin (E) melanin content (F) potassium (G) magnesium (H) Helping it

C