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").

The circulatory system brings oxygen to the body from where? (A) The chest (B) The brain (C) The feet (D) The stomach
A

An early example of harnessing wind power would be (A) unicorns (B) santas flying reindeer (C) trumps windy speeches (D) cloth on masts
D

Camouflage can be used by animals for hunting (A) trees (B) meals (C) air (D) water

B