Ithink it is a, check my answer?
two hominid fossils are found in the same rock strata in caves about 10 kilometers apart in france. after radioactive dating, both are found to be about 150,000 years old. what else should be done before they are assigned to the same species?

a - excavate deeper rock layers.
b - look for evidence of tool use.
c - find more fossils in both caves.
d - compare anatomical structures.