Which quotation from Flatland most effectively illustrates the claim?

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Flatland is an 1884 novel by Edwin A. Abbott. The narrator describes the novel’s setting as a world consisting entirely of two-dimensional geometric figures, whose existence is confined to the surface of a plane: ________

Which quotation from Flatland most effectively illustrates the claim?

"As early as the eleventh century of our era, triangular houses were universally forbidden by Law, the only exceptions being fortifications, [gun]powder magazines, barracks, and other state buildings, which is not desirable that the general public should approach."

"Every human being in Flatland is a Regular Figure, that is to say of regular construction. By this I mean that a Woman must not only be a line, but a straight line; that an Artisan or Soldier must have two of his sides equal."

"The sizes of the [figures'] sides would of course depend upon the age of the individual.... A tall adult Woman might extend to a foot. As to the Males of every class, it may be roughly said that the length of an adult’s size, when added together, is

"I call our world Flatland, not because we call it so, but to make its nature clearer to you, my happy readers, who are privileged to live in Space."