Can be formed after many hypotheses, experiments, and observations have been made that all validate the same idea.

a) major ideas

b) scientific theories

c) scientific evidence

I think the answer is B) Scientific Theories.

answer: enthalpy

explanation:

for a exothermic reaction, the energy is released i.e. the energy of the products is lower than the energy of the reactants.

= enthaply

= energy of products

= energy of reactants

as , thus comes out to be negative. negative value of enthalpy shows that the reaction is exothermic.