Response:
The statements that are correct include the first, the second, and the last.
Since tigers and foxes rely on the same food source, specifically goats, a reduction in goat populations would create scarcity in food for both species.
As a result, competition for this limited resource will arise (interspecific).
Furthermore, there would also be an increase in intraspecific competition. For instance, one group of foxes might contend with another group over the same goats.
The decline in goat numbers would lead to a reduction in biomass at the secondary trophic level. As a consequence, the biomass at higher trophic levels would also decline as biomass decreases with each successive level.
Thus, the available biomass at the carnivores' trophic level would decrease due to the reduction of goats.