To calculate the adjusted amount of energy that is available to organisms that are one trophic level above producers, you would use the following relationship:
Net Primary Productivity (NPP) is the amount of energy that remains after producers have used some of the energy for respiration.
Therefore, the correct answer is:
Net primary productivity plus amount of organic material used in respiration.
However, please note that typically the energy available to the next trophic level (like primary consumers) is represented simply by the net primary productivity (NPP), since it accounts for the energy that is not used in respiration by producers. So for clarity, if you are looking for the energy available to the next trophic level, you would just consider the NPP itself.
But if it is strictly about how to assess total energy before considering respiratory losses, your response would include respiration as part of the total energy dynamics within the ecosystem.
In summary, while NPP is the direct measure of energy available for the next trophic level, the way you expressed the relationship involves considering total input before losses.