In the context of proposals to the use of hydrogen-enriched CNG (H-CNG) as fuel for buses in public transport, consider the following statements:1. The main advantage of the use of H-CNG is the elimination of carbon monoxide emissions.2. H-CNG as a fuel reduces carbon dioxide and hydrocarbon emissions.3. Hydrogen up to one-fifth by volume can be blended with CNG as fuel for buses.4. H-CNG makes the fuel less expensive than CNG.Which of the statements given above is/are correct?

In the context of proposals to the use of hydrogen-enriched CNG (H-CNG

1.	In the context of proposals to the use of hydrogen-enriched CNG (H-CNG) as fuel for buses in public transport, consider the following statements:1. The main advantage of the use of H-CNG is the elimination of carbon monoxide emissions.2. H-CNG as a fuel reduces carbon dioxide and hydrocarbon emissions.3. Hydrogen up to one-fifth by volume can be blended with CNG as fuel for buses.4. H-CNG makes the fuel less expensive than CNG.Which of the statements given above is/are correct?
A.	1 only
B.	2 and 3 only
C.	4 only
D.	1, 2, 3 and 4
Answer» C. 4 only