Don't answer this i am just trying to post a question to go and see the questions. you can answer any random thing if you wanted to get this "question" points i wont mind that "i know what you are up too and your free pts ; )"

i think it's c. if you look search electronic symbol on google and then click on wiki it shows you a

definition

                    entropy is a measure of the randomness or the extent of disorder of a chemical process.

                      enthalpy is a measure of the heat change of a reaction occurring at a constant pressure.

measurement units:

                        entropy is measured in joule per kelvin (jk⁻¹)   whereas enthalpy is measured in joule per mole (jmol⁻¹)

requirements:

                            entropy has no requirements or limits, and its change is measured by the division between the heat change of the chemical process and the temperature.

                              in contrast, enthalpy can only be related to the heat change of the reaction under standard conditions.

a corroding iron, if that's one of your choices