Which one of the following has the highest calorific value?

Calorific value, also known as heating value or energy value, is a measure of the amount of energy released during the complete combustion of a substance. It is typically expressed in units of energy per unit mass of the substance, such as joules per kilogram (J/kg) or kilojoules per kilogram (kJ/kg). 

The calorific value of a fuel gives an indication of its energy content and is an important factor in determining its suitability for various applications, such as heating, cooking, or power generation.