Finite groups with subnormal derived subgroups of $B$-groups

A finite non-nilpotent group $G$ is called $B$-group if every proper subgroup of the quotient group $G /\Phi(G)$ is nilpotent. In this paper, it is established that the metanilpotency of a finite group for which the derived subgroup of each $B$-subgroup is subnormal.