What would likely happen to a boulder in the path of a glacier? A. It would stop the glacier from moving. B. It would cut a hole through the glacier. C. It would be ground into fine sediment by the glacier. D. Nothing would happen because glaciers do not move.

Themes; subfields is the answer

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

I'm guessing  a. diverse  because it shows a wide variety of many things.