It was a transformation of human life circumstances
As a writer, after structural revising, I tend to revise grammically, and change any sentence errors, or change any phrases or words!!
The answer is A. Fossils have been found by the local science club. Since the verb, found, is being done to the subject, fossils, it is in the passive voice. The others are in the active voice since the action is being done by the subject.
The narrator's tone is arrogant and excited