instruction:
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").
question:
2000 years ago, this method would likely have brought sand from the coast to the desert (A) the pyramids often eroded, making their own sand (B) constant breezes over time (C) human automobiles transfer materials (D) the space shuttle moved sand great distances
answer:
B

question:
What needs measurements taken in the morning and evening? (A) coastal range (B) tidal range (C) wave length (D) apex
answer:
B

question:
If you're in the North Pole the North Star may be visible when? (A) a weed (B) two months (C) a day (D) all year round
answer:
D