answer;
a. sheep consumption efficiency would be reduced.
explanation;
-trophic efficiency is a measure of how much energy occurs at one level divided by the energy at the level immediately below it . trophic efficiency incorporates three types of efficiency:
-the proportion of available energy that is consumed (consumption efficiency). it is the proportion of the available biomass that is ingested by consumers.
-the proportion of ingested food that is assimilated (assimilation efficiency).
-the proportion of assimilated food that goes into new consumer biomass (production efficiency).
-in this case, the grasshoppers would affect sheep by reducing the proportion of the available biomass that is ingested by the sheep.