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.

relative dating involves things like higher layers are most recent than rocks lower in the sequence. this can be extended to the known sequence of fossils. rocks containing rabbit fossils are later than those containing dinosaur fossils.  

absolute dating methods mainly use radioactive elements that have known rates of decay and produce recognizable products. for example potassium 40 decays to produce argon. once a rock has solidified the argon is trapped. by measuring the argon and potassium0 you can get an accurate number for the age.  

some other methods are good for archaeological ages. dendrochronology involves recognizing the sequence of tree rings. the orientation of magnetized particles in baked clay can be used to date a fire.

hope this .. .