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").

[EX Q]: Fact1: Carbon may be stored in sedimentary rock for millions of years., Fact2: Limestone is a type of sedimentary rock., Question: What element can be stored in limestone for millions of years? (A) oxygen (B) Energy (C) matter (D) carbon (E) sodium (F) helium (G) rock salt (H) heat
[EX A]: D

[EX Q]: Fact1: Evolution occurs in response to a change in the environment., Fact2: Evolution Evolution is the changing pattern of life forms., Question: what happens in response to change in environment? (A) Plant growth is reduced (B) the wearing away of rock (C) lifeforms change their pattern (D) antimatter (E) density changes (F) Warm air moving into cold air (G) erosion from rivers (H) gravity changes
[EX A]: C

[EX Q]: Fact1: electric devices require electrical energy to function, Fact2: Ordinary phone is also a mobile device., Question: What do phones require to function? (A) encoded information (B) graduated cylinderr (C) math (D) electrically (E) electrical energy (F) magnifying glass (G) hydrogen and oxygen (H) electromagnetic energy
[EX A]:
E