Which example shows electrical energy being transformed into heat energy? a) burning a wax candle b) a small toaster oven toasts a bagel c) rubbing two sticks together d) sunlight heating a metal door

I believe it's option B.

The correct answer is B.

The problem here is that according to aufbau principle before 3d orbital 4s subshell comes.after filling 3p orbital with electrons you have 4 electrons left, you place two in 4s with opposite spin and the other two in 3d in any of its two orbitals of total five orbitals with the same spin.