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: soil is formed by rocks eroding, Fact2: Rivers erode the rocks they flow over., Question: What is formed by rivers? (A) fish (B) soil (C) rain (D) bamboo (E) spring (F) clouds (G) kayaks (H) NaCl
[EX A]: B

[EX Q]: Fact1: Organisms cluster around hydrothermal vents in the ocean floor., Fact2: Background Hot water vents form inside cracks in the ocean floor., Question: Organisms cluster around hot water inside cracks where? (A) loose soil (B) ocean floor (C) food and shelter (D) tectonic plates (E) the ground (F) allow growth (G) Absorb light (H) survive
[EX A]: B

[EX Q]: Fact1: competition may cause animals to fight towards members of their own species, Fact2: Competition for nest sites can be fierce and fighting is common., Question: fierce fighting for nest sites may cause animals to fight towards who? (A) food and shelter (B) members of their own species (C) other living things (D) Something with a head, thorax, and abdomen (E) large fish (F) creatures with hair (G) Males and females (H) members of orders
[EX A]:
B