Which pair can be classified as belonging to the set of the five classical energies? A. Sound, gravity
B. Kinetic
C. Chemical
D. Gasoline
E. Nuclear
F. Chemical, radiant

Coal i believe hope this

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.

They cool it down and aluminum cools easily

Ithink that one is (c)