The correct answer to this question is C, Electric to thermal. Electric toasters are used in many homes to make toast, waffles, and frozen pastries. A toaster transfers electric energy taken from the electrical outlet into thermal energy, which is heat.
In the toaster, there are filaments, also known as wires, which turn red. They do this because that is the heat which warms the toast, waffles, and pastries. These filaments get very hot and shouldn't be touched. While all toasters cook quickly, the higher the watt rating on the toaster, represents, the faster it can heat and cook the food.