The table shown lists the bond dissociation energies $\left({\mathrm{E}}_{\text{diss }}\right)$ for single covalent bonds formed between carbon and atoms of elements $\mathrm{A},\mathrm{B},\mathrm{C}$ and $\mathrm{D}$. Which element is the smallest atom?

The element 'D' has the smallest atoms. It corresponds to strongest $\mathrm{C}-\mathrm{D}$ bond and maximum bond dissociation energy $(485 \mathrm{kJ}/\mathrm{mol})$.
Smaller is the bond length, stronger is the bond and higher is the bond dissociation energy.

Hence, the correct option is (B) .