Characteristics of two fuels X and Y are given in chart

Which fuel is an ideal fuel ?

Options

A. Fuel X, because it has lower ignition temperature and lower calorific value.
B. Fuel Y, because it has higher ignition temperature and lower calorific value.
C. Fuel X, because it has lower ignition temperature and is producing CO and `SO_2`
D. Fuel Y, because it has higher calorific value and is producing only `CO_(2)`

Explanation

An ideal fuel produces a large amount of heat, should burn without giving harmful gases and it should have a proper ignition temperature.