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: Behaviors that improve fitness increase through natural selection., Fact2: Fitness traits relate to an animal s ability to survive and reproduce., Question: behaviors increase through what that improve traits of animal's ability to survive (A) competition (B) hunting (C) biological diversity (D) the environment (E) eating (F) produce offspring (G) natural selection (H) grooming
[EX A]: G

[EX Q]: Fact1: erosion causes a river to become deeper and wider, Fact2: Weathering and erosion continue to shape it today., Question: Weathering causes what to become deeper and wider? (A) a landslide (B) Sediment (C) a mountain (D) a volcano (E) soils (F) rock (G) flooding (H) a river
[EX A]: H

[EX Q]: Fact1: competition may cause animals to fight towards members of their own species, Fact2: Lions are members of the 'Panthera leo' species., Question: What may cause lions to fight other lions? (A) influenza (B) Pesticides (C) cooperation (D) heat energy (E) competition (F) tradition (G) boredom (H) hormones
[EX A]:
E