A would be the correct answer.
An indefinite pronoun is a pronoun that doesn't refer to a person or thing in particular so i'm going to say C. each
Ray Bradbury was always scared of the future. Books that he wrote including the Pedestrian and Fahrenheit 451, were about the future and what it will become. I believe that if Ray Bradbury were alive today, he would feel very strongly about limiting our use of technology.
Hope this helps! Have a great day :)