Photosynthetic can use light energy of the sun to produce their own food.
a.) autotrophs
b.) material
c.) heterotrophs
and if you can explain the answer it would be appreciated.

The right answer is autotrophs.

To be autotrophic, an organism needs specialized organs. Leaves, for example, concentrate the different organelles capable of producing organic matter.

An autotrophic organism is an organism capable of generating its own organic matter from mineral elements. It uses for this purpose the light energy either by photosynthesis or by chemosynthesis in some species.