The correct answer is:
d It will decrease because the amount of chemical energy photosynthesis generates will not be enough to support higher trophic levels.
When a large percentage of the grasses (primary producers) are destroyed by fire, the overall biomass available for the primary consumers (the second trophic level) is reduced. This reduction in primary production leads to less available energy for higher trophic levels (e.g., primary consumers and secondary consumers), ultimately causing a decrease in biomass at the top of the pyramid.