Fuel cells

Arequire recharging
Bemit carbon dioxide
Crely on combustion to produce energy
Dall of these
Enone of these

Verified Answer :

The answer would be D. All of these

LEt's take battery for example. 
1. It require its electrolyte to be recharged in order to be reused.
2. Rely in combustion to produce energy
3. The residual value of the combustion process is released as carbon dioxide to the atmposphere