When measuring the enthalpy of combustion/enthalpy of reaction for a combustion reaction, the results from practical investigations are usually quite different to
theoretical values. Identify the reasons that this may be most likely below.

A. Insulation on the coffee cup calorimeter is poor, and heat isreleased to the environment. The measured temperature is less
than the theoretical values.

B. Insulation on the can calorimeter is poor, and heat is absorbedfrom the environment. The measured temperature is higher than
the theoretical values.

C. The heat from the combustion is distributed evenly throughout
the can calorimeter, meaning that it is more accurate than the best theoretical predictions.
D. Heat is lost to the environment between the source of combustion and the calorimeter. The measured temperature is less than the theoretical values.