A small block of density \( \rho_{b} \) is held at a depth \( d \) below the surface of a calm pond of water with density \( \rho_{w} \), where \( \rho_{w} > \rho_{b} \). The block is released from rest and rises toward the surface. Neglecting the effects of water resistance, air resistance, and the brief period during which the block is partially submerged as it breaks the surface, which of the following is a correct expression for the maximum height \( H \) the block reaches above the water's surface?