Th correct statements among (a) to (d)

Th correct statements among (a) to (d) regarding $\mathrm{H}_{2}$ as a fuel are :

(a) It produces less pollutant than petrol

(b) A cylinder of compressed dihydrogen weighs $\sim 30$ times more than a petrol tank producing the same amount of energy

(c) Dihydrogen is stored in tanks of metal alloys like $\mathrm{NaNi}_{5}$

(d) On combustion, values of energy released per gram of liquid dihydrogen and LPG are 50 and $142 \mathrm{~kJ}$, respectively