The bond dissociation energy of $\text{B}-\text{F}$ in ${\text{BF}}_3$ is $646{\text{kJ mol}}^{-1}$ whereas that of $\text{C}-\text{F}$ in ${\text{CF}}_4$ is $515{\text{kJ mol}}^{-1}$. The correct reason for higher $\text{B}-\text{F}$ bond dissociation energy as compared to that of $\text{C}-\text{F}$ is:

1. A
   smaller size of B-atom as compared to that of C-atom
2. B
   stronger $\sigma$ bond between B and F in ${\text{BF}}_3$ as compared to that between C and F in ${\text{CF}}_4$
3. C
   significant $p\pi -p\pi$ interaction between B and F in ${\text{BF}}_3$ whereas there is no possibility of such interaction between C and F in ${\text{CF}}_4$
4. D
   lower degree of $p\pi -p\pi$ interaction between B and F in ${\text{BF}}_3$ than that between C and F in ${\text{CF}}_4$