物が詰め物になるまで、どれだけ詰め物を詰め物に詰め込めますか？Use google translate

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.

The correct answer would be b) volume versus temperature, because they are also directly proportional.