Your question looks a bit incomplete as you have the same contents in options a) and d). According to your list, I can't see the correct answer, but I can give you one.The difference between the potential energy of the products of the potential energy of the reactants is equal to the enthalpy of the reaction.
I think kepler would be the one to best describe the motion of hte earth because he has a space telescope named after him
Because it is ferromagnetic