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").

an animal needs to burn complex carbohydrates to (A) stay up (B) move (C) sit (D) sleep
B

Which likely increased atmospheric CO2 recently? (A) sustainable fisheries (B) electric cars (C) motorcycles (D) ant populations
C

An example of weathering is (A) a smooth sandy beach (B) a smooth river stone (C) a tall pine tree (D) a large sharp boulder

B