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").

[EX Q]: The sidewalk next to a house having a crack in it and having vegetation growing from it is considered? (A) insects (B) weathering (C) erosion (D) lava
[EX A]: B

[EX Q]: Polar bears are best suited for (A) colder places (B) hotter regions (C) Jupiter's polar caps (D) northern desert regions
[EX A]: A

[EX Q]: the Earth rotating on its axis causes the sun to appear to move across the sky during what? (A) dark hours (B) sunlight deficient (C) night (D) waking hours
[EX A]:
D