Which of the Following Allowed Scientists to Determine Whether Early

Which of the following allowed scientists to determine whether early hominins were browsers (eating shrubs primarily) or grazers (eating grasses primarily) ?

A) Shrubs and grasses differ in the type of photosynthesis they perform.
B) Shrubs and grasses have different carbon isotopic signatures.
C) Fossil remains of plants surrounding hominins indicate what they most likely ate.
D) a and b
E) a, b, and c