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 earth revolves around the sun in (A) a day (B) a year (C) a week (D) a month
[EX A]: B

[EX Q]: Greenhouses are great for plants like (A) Pizza (B) Lollipops (C) Candles (D) French beans
[EX A]: D

[EX Q]: a compass uses iron to locate the northern (A) latitude (B) axis (C) shoreline (D) hemisphere
[EX A]:
B