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").

[Q]: Fact1: a light bulb converts electrical energy into light energy when it is turned on, Fact2: Light bulbs are rated in Watts., Question: How is converted energy into light energy rated? (A) energy (B) unique (C) heat (D) good (E) watts (F) parsec (G) kilojoule (H) kinetic energy
[A]: E


[Q]: Fact1: a prism is used for refracting light, Fact2: Refraction is the bending of light cause by a speed change when it passes through different media., Question: What aspect of light changes when it passes from air into a prism? (A) power (B) seasons (C) speed (D) energy (E) a wave (F) Joules (G) heat (H) unique
[A]: C


[Q]: Fact1: recycling reduces the resources needed to make something, Fact2: Recycling also saves energy., Question: What reduces the resources needed to make something? (A) water conservation (B) A computer (C) saving energy (D) Pollution (E) electron microscope (F) power stations (G) Fuel cells (H) Electrical energy
[A]:
C