Final answer:
Energy can be measured in various units such as calories, joules, kilocalories, and kilowatt-hours; all of these have been used historically, so to find the odd one out, we need a list with a non-energy unit.
Step-by-step explanation:
All but one of the following units have been used to measure energy, at different periods of history and in different countries. The units that have been used to measure energy include the calorie, the joule, the kilocalorie (kcal), and the kilowatt-hour (kWh), among others. The calorie is the amount of heat required to raise the temperature of 1 gram of water by 1°C.
The joule is the SI unit of energy, where one joule is the amount of energy used when a force of one newton moves an object one meter. Other units such as the British Thermal Unit (Btu) and the therm have also been used historically. Therefore, to identify the odd one out, we would need a list that includes an option that is not a unit of energy measurement.