Read the text and choose the appropriate answer.
Persian cats probably originated in Asia Minor; they were introduced to Europe in the 1700s, where they were called French cats or Angolas. They became popular in Britain during Queen Victoria`s reign; she and other members of the royal family kept blue Persians. They have been exhibited in cat shows as a recognized breed for more than a hundred years, and people always admire them. The first cat show in Britain, in 1871, included black, and white Persians. The Persians has changed significantly since then; early Persians had much longer bodies, larger ears, smaller eyes, and longer faces than today`s short-faced, round-eyed Persians.
By which of the following could the word «breed» best be replaced?