An inverted pyramid of biomass can be found in:

The correct answer is Option (4) → Sea

Option (4) Sea — Correct. A pyramid of biomass is usually upright, but in the sea it is generally inverted. The biomass of fishes at any time far exceeds that of the phytoplankton, which are small and short-lived though they multiply fast.

NCERT Extract:
Ecological Pyramids – “… In most ecosystems, all the pyramids, of number, of energy and biomass are upright, i.e., producers are more in number and biomass than the herbivores, and herbivores are more in number and biomass than the carnivores. Also energy at a lower trophic level is always more than at a higher level. There are exceptions to this generalisation: … The pyramid of biomass in sea is generally inverted because the biomass of fishes far exceeds that of phytoplankton.”