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: Feathers help birds fly and provide insulation., Fact2: Some birds are flightless birds., Question: Why do the flightless have feathers? (A) layers of fat (B) Sublimation (C) it needs them (D) warm-blooded (E) Air conditioning (F) Radiation (G) Insulation (H) protect them
G

Fact1: the Himalayas were formed by rock folding, Fact2: Movements in the earth's crust have folded and cracked the older rocks., Question: the Himalayas were formed from older what (A) soils (B) plates (C) rivers (D) rock (E) eras (F) meadows (G) dirt (H) plains
D

Fact1: Ethanol is produced by alcoholic fermentation of the glucose in corn or other plants., Fact2: Methanol and Ethanol are two types of alcohol fuels used in cars., Question: Which product is widely used today to make fuel for cars? (A) swamp gas (B) corn (C) comets (D) meteorites (E) fat (F) energy (G) oil (H) Carbon

B