Given below are the comparative data of certain fuels.

Coal is not considered to be an ideal household fuel because

Options

A. lot of fuel is wasted in the form of ash and its ignition temperature is high
B. it has low calorific value
C. it produces smoke, sulphur dioxide and unburnt carbon particles
D. all of these.

Answer

D

Explanation

Coal leaves a lots of residue and produces pollutants.