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

[EX Q]: Which is nonmagnetic? (A) nail (B) washing machine (C) traffic cone (D) refrigerator
[EX A]: C

[EX Q]: a little rat startles a cat and ends up as the cat's lunch. What does that make the car? (A) the cat is a dog (B) the cat is a bad cat (C) the cat is carnivorous or omnivorous (D) the cat loves milk
[EX A]:
C