Which ones is it I've tried this multiple times and can't move on till i make a 100

A C G H
I know because i took this nightmare of a test and almost had a mental breakdown

So  if  the sum of the enthalpies of the reactants is greater than the products, the  reaction  will be  exothermic.  if  the products side has a larger enthalpy, the  reaction  is  endothermic. you may wonder why  endothermic reactions, which soak up energy or enthalpy from the environment, even happen

Answer (d) may increase or decrease porosity through dissolution or deposition;