In this task, you are given a multiple-choice question and you have to pick the correct option. Answer with option indexes (i.e., "A", "B", "C", and "D").

[Q]: if a chemical reaction occurs, it might have been triggered by which of these? (A) a person yelling at it (B) a person walking by it (C) a person looking at it intently (D) a person cranking up the room heater
[A]: D


[Q]: Why would a species camouflage as a dangerous animal? (A) to mate (B) to avoid crocodiles (C) to catch prey (D) to  build nests
[A]: B


[Q]: What is animal competition? (A) wolves and bears eating salmon (B) a shark and marlin swimming fast (C) gazelles and zebras living on the plains (D) an oxpecker helping a rhino
[A]:
A