Assertion : Compressed natural gas (CNG) is natural gas under pressure and mainly composed of methane.
Reason : One of the advantages of using CNG as a fuel in automobiles is that it requires very less space for storage as compared to that of petrol or diesel.

Answer

C

Explanation

Comptessed natural gas (CNG), is made by compressing natural gas (which is mainly compsed of methane, `CH_(4)`). It is a better fuedl tan petrol or diesel as its combustion produces fewer undesirable gases that petrol or diesel. The cost and placement of fuel storage tanks is the major barrier to wider adoption of CNG as a fuel. CNG vehicles require a great amount of space for fuel storage than conventional gasoline powered vehicles. Laying down pipelines to deliver CNG through distribution points/pumps is another difficulty faced in switching over to CNG as an automobile fuel.