A good fuel is one which possesses:
(a) high calorific value and low ignition temperature.
(b) high calorific value and high ignition temperature.
(c) high calorific value and moderate ignition temperature.
(d) low calorific value and moderate ignition temperature.
(c) high calorific value and moderate ignition temperature
Explanation
A good fuel should have a high calorific value so that it can give us a sufficient amount of heat per unit mass. It should also have a moderate ignition temperature so that it burns easily, this means that it should neither be too low nor too high.
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