Q: 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").
If you add heat to something, a chemical reaction may take place, like when (A) ingredients are mixed in a bowl (B) coffee is warmed in a microwave (C) mixed ingredients become a cupcake (D) pasta is warmed on a stove
A:
C