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

A: C
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Q: A bear hibernates through cold weather because (A) bears get very tired (B) it is gestating young (C) resources are scarce in winter (D) winter is too cold

A: C
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Q: Vegetables provide a lot of nutrients for (A) cats (B) dogs (C) humans (D) snakes

A:
C
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