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]: Riding a two wheeled human powered vehicle is good for the environment because (A) it runs without fuel (B) it helps people stay in shape (C) they are cheaper to maintain (D) they are more fun to drive
[EX A]: A

[EX Q]: What is the best example of a live birth? (A) a fish laying a clutch (B) a platypus warming an egg with its furry body until a baby is born (C) a bird warming the eggs in her nest until they hatch (D) a koala delivering into her pouch
[EX A]: D

[EX Q]: Which is likeliest to harm an organism? (A) a naval mine (B) a short drizzle (C) eating a meal (D) a light breeze
[EX A]:
A