You're right. It's a or b but it is not kinetic energy.
http://chemwiki.ucdavis.edu/Physical_Chemistry/Thermodynamics/State_Functions/Enthalpy
What is enthalpy?
A. Enthalpy is the kinetic energy of a system.
B. Enthalpy is the heat involved in a reaction.
C. Enthalpy is the temperature of a reaction.
D. Enthalpy is the mass involved in a reaction.
I think the answer is a or b
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