The correct match is

In Diamond "C" undergoes "sp3" hybridisation, then in this case C — C bond length is 1.54 AoIn Graphite the "C" undergoes "sp2" hybridisation, the C — C bond length is 1.42 AoIn Acetylene the "C" undergoes "sp" hybridisation, the C — C bond length is 1.20 AoIn Benzene th C- atom undergoes "SP2" hybridisation, the C — C bond length is 1.39 Ao                            Diamond > Graphite > Benzene > AcetyleneC — C bond length: 1.54 Ao     >   1.42 Ao    >   1.39 Ao   >      1.20 Ao