Answer: B) They help trace the physical and evolutionary development of early human ancestors
Explanation: Fossils are remains of ancient creatures and plants that were lucky enough to be in the right environmental conditions to be preserved. Fossils are mainly used to determine the physical characteristics of past organisms, and how these physical traits changed over time as species evolved.
Choices D and C are incorrect since fossils are only physical remains of hominid individuals. It would be impossible to learn about their cultures or agricultural practices with fossils alone. We can only learn about the physical characteristics of early hominids from fossils, their societies and practices can't be gleamed from the remains of their bones.
Choice A is incorrect because most fossils are not preserved well enough to include whatever tools or clothing early hominids may have had on them at the time. Usually, the remains of tools, clothing, and settlements are found separate from fossil remains. These archeological antiques serve as better evidence of technological advancements than the fossils themselves.