question_answer

Fill in the blanks with most appropriate option.

Bio-gas is an excellent fuel as i1 contains up to 75% ___(i)___ . It burns without smoke, leaves no residue like ash in wood. Its heating capacity is ___(ii)___ . The slurry left behind is removed periodically and used as excellent manure, rich in ___(iii)___ and ___(iv)___.

 

A)

(i)	(ii)	(iii)	(iv)
Methane	High	Nitrogen	Phosphorous

               

B)

(i)	(ii)	(iii)	(iv)
Nitrogen	Low	Methane	Phosphorous

               

C)

(i)	(ii)	(iii)	(iv)
Methane	Low	Nitrogen	Oxygen

               

D)

(i)	(ii)	(iii)	(iv)
Oxygen	High	Nitrogen	Phosphorous