Resonance energy of benzene is

•  Aromaticity is essentially connected to the phrase resonance energy. 
• Through resonance energy, the aromaticity is initially identified. 
• Resonance energy, to put it simply, is the energy that aids in identifying any molecules' delocalized electrons when more than one Lewis structure is unable to adequately express the bonding. 

Hence option (B) $36\text{ Kcals }{\mathrm{Mol}}^{-1}$, is correct.