I would definitely prefer LPG,because
1.LPG is mostly eco-friendly when compared to cakes and coal
2. It doesn't release any harmful gases and other substances.
3.coal on burning releases harmful gases like methane and carbon-di-oxide,which cause global warming and fast melting of glaciers.
4.cow dung cakes release gases which may cause cancer.
That is the reason I will select LPG as fuel.
PLEASE THANK ME AND MARK MY ANSWER AS THE BRAINLIEST.