Which of the following quotes does not illustrates that fahrenheit 451 takes place in the future?

question 4 options:

a)

“‘have you seen the two-hundred-foot-long billboards in the country beyond town? did you know that once billboards were only twenty feet long? ’” (bradbury).

b)

“’bet i know something else you don't. there's dew on the grass in the morning.’ he suddenly couldn't remember if he had known this or not, and it made him quite irritable.” (bradbury).

c)

“strange. i heard once that a long time ago houses used to burn by accident and they needed firemen to stop the flames” (bradbury).

d)

“they walked still further and the girl said, ‘is it true that long ago firemen put fires out instead of going to start them? ’” (bradbury).