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").
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Question: the presence of which of these is required for the formation of cavernous chambers? (A) some carbonated soda (B) some carbon dioxide (C) some carbonic acid (D) carbon monoxide gas

Answer: C


Question: An example of an instinctive behavior is (A) doing a cartwheel outside (B) singing on a stage (C) eating a large pizza (D) a mother feeding the kids

Answer: D


Question: An example of how melting is achieved is seen in (A) cooking stew in a crockpot (B) using an oven to heat a pizza (C) using a stove to warm frozen vegetables (D) using a hairdryer to turn ice to water

Answer:
D