To measure the enthalpy of a given reaction and the reaction needs to be at atmospheric pressure so (C) coffee cup calorimetry is the best option.
A calorimeter that measures heat under constant pressure is called a coffee cup calorimeter. As a result, the heat detected by such a device is equal to the change in enthalpy. The use of a coffee cup calorimeter is typically reserved for the study of solution-based chemistry, which typically involves a reaction in which the volume is affected very little if any. So the best option is option (c) "coffee cup calorimetry" because the experiment is to be performed under atmospheric pressure which is constant.
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