I need help on this one im studying for my final. Bio 20 help?

the Sun's incoming solar radiation is stronger at the equator than at the Earth's poles. What effect might this have on ecosystems at the equator and in the northern hemisphere?

a. The total energy in the ecosystem at the equator will be higher due to more incoming radiation and more photosynthetic activity.

b. As a result of the incoming radiation, less energy will be lost as it is transferred between tropic levels in the ecosystem at the equator.

c. The ecosystems will have the same total energy because the plants at the equator will not trap as much energy as the plants at the northern hemisphere.

d. all of the above