Which one has an error?

Answer A

If you didn't ace this one, take heart: the distinction has become increasingly grey through the years. In British English, the terms are actually used almost interchangeably. In American usage, however, there is one simple — but key — difference: farther is used for actual physical distances. Get it? FAR? Further, on the other hand, refers to more abstract or figurative distances, such as how much further you'll go in life or how much further she'll take the joke.

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