Define Endothermic reaction in terms of Deta H

Answer it is also known as the completion state is untrue of the activation complex;

Ithink the answer is c

The internal energy of the system we can term it as total potential energy and kinetic energy. energy flows out of the surrounding from the system then we can say that the internal energy of the final state is lower than its initials. the sign of  δesystem is negative.δesystem = efinal - einitial=-ve  efinal  ∠einitial.