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").

In order for crops to grow food safely pesticides are used on them. When it floods, this can cause what to be poisonous? (A) Corn (B) air (C) Runoff (D) farmers
C

An object converts electrical energy into sound on a (A) iphone (B) soft carpet (C) outside wall (D) wooden table
A

You can let someone know you are at the door thanks to a (A) lemonade (B) cars (C) grass. (D) power plant
D