It's actually Friction.
I just did the test and got it right.
B THEY ARE BOTH CAUSED BY TEMPERTURE
Answer: QUANTUM MECHANICAL MODEL OF THE ATOM.
Explanation:Edwin Schrodinger is an Australian Physicist,who proposed the Quantum mechanical model of an Atom,this theory helped to give a better understanding of Bohr's model.
According to Bohr's model,it is believed that electrons are concentrated around the circular shell of the Nucleus of an Atom which Edwin Schrodinger improved by proofing that the Behaviors of electrons around an the Nucleus of an Atom can be explained by the Mathematical representation of their waves.