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: matter vibrating can cause sound, Fact2: All matter emits vibrations., Question: What kind of matter can produce sound? (A) sensory neurons (B) all matter (C) an object (D) only liquids (E) mechanical (F) only plasma (G) only solids (H) waves
B

Fact1: coal is used for generating heat by burning, Fact2: Coal and lignite are the lithified remains of plants., Question: What are the lithified remains of plants used for? (A) heat production (B) generating heat by burning (C) harvesting crops (D) damming rivers (E) food and shelter (F) heat is produced (G) A transportation fuel (H) planting seeds
B

Fact1: a polar bear requires a cold environment, Fact2: Arctic air masses are exceedingly cold, with the Arctic Ocean as their source region., Question: Where can polar bears live? (A) in unnatural habitats (B) aquatic (C) in volcanoes (D) log cabins (E) in deserts (F) the Arctic (G) Being over land (H) the environment

F