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: matter vibrating can cause sound, Fact2: Thus, sound is a wave in air ., Question: what can matter vibrating cause? (A) Pollution (B) energy (C) Relieve pain (D) kinetic energy (E) wave in air (F) Energy. (G) murmur (H) Greenhouse gases
[EX A]: E

[EX Q]: Fact1: a delta is formed by deposition of sediment at the mouth of a river by water fanning out, Fact2: Rivers provide a water supply., Question: What is formed by deposition of sediment at the mouth of a water supply fanning out? (A) a hurricane (B) soils (C) a delta (D) an ocean (E) soft soil (F) an island (G) detritus (H) spring
[EX A]: C

[EX Q]: Fact1: when a cooler object touches a warmer object , thermal conduction occurs, Fact2: When the glacier moves into warmer areas the ice melts and sediments are deposited., Question: Glaciers melt via (A) vaporization (B) thermal conduction (C) Water expanding (D) colder temperatures (E) mountain sources (F) internal combustion (G) decreased wind (H) Physical weathering
[EX A]:
B