The correct option is C CH3−Br
Preperation of alkane from alkyl halide :
Methane preparation from CH3Br :
CH3−Br+H2Zn,dil. HCl⟶CH4+ZnBr2
Here Zn,dil.HCl acts as reducing agent.
Ethane preperation from CH3Br:
Wurtz reaction :
CH3−Br+2Na+Br−CH3Dry ether⟶CH3−CH3+2NaBr