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: insulated material can be used for keeping warm, Fact2: An insulated cup with a cover is great for keeping beverages warm., Question: How do you keep a cup hot? (A) less water (B) electricity (C) heat energy (D) adding heat (E) energy usage (F) insulation (G) squeeze (H) energy
F

Fact1: volcanic ash in the atmosphere decreases the temperature by blocking the sun, Fact2: Ash clouds are a particular problem for aircraft., Question: What are particular problems for aircraft in the atmosphere? (A) transportation (B) clog airways (C) extremely low humidity (D) volcanic clouds (E) feedback mechanisms (F) negative feedback (G) gas spreads in the air (H) very complex
D

Fact1: if a habitat can no longer support animals then those animals will move to another area, Fact2: Cows are social animals., Question: what will move to another area if their habitat will no longer support them? (A) density (B) Birds (C) squids (D) humans (E) clouds (F) gravity (G) cows (H) Whales
G