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In proposals for hydrogen-enriched CNG as fuel for buses (2020), which statements are correct?

A. (a) 1 only
B. (b) 2 and 3 only
C. (c) 4 only
D. (d) 1, 2, 3 and 4

Explanation:

Explanation: Hydrogen-enriched CNG reduces CO2 and hydrocarbon emissions, and blending up to one-fifth hydrogen is feasible.