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").

[Q]: Pollution is (A) throwing a gum wrapper in the ocean (B) trees in a forest (C) Fish swimming in the sea (D) The wind carrying seeds
[A]: A

[Q]: do all insects have to undergo every stage of change before becoming full grown? (A) all of these (B) insects are born live (C) pupa stage is sometimes skipped (D) pupa is a required stage
[A]: C

[Q]: If something were to be melted, it would be heated above its melting point, like (A) putting peas in a soup (B) putting jello in warm water (C) putting ice in the freezer (D) cooking up cookie dough
[A]:
B