b5a184…: “Owing to the bitter gulf”

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Four equally spaced numbers are shown below on a number line.

Let $f(t) = t^2$ and consider $f(x)$ and $f(y)$ and $f(z)$ and $f(w)$ . Which pair of numbers is farthest apart?

The pair $f(x)$ and $f(y)$ . The pair $f(y)$ and $f(z)$ . The pair $f(z)$ and $f(w)$ . These pairs are all equally far apart