Why Were the "Puritans" Known by That Name

Why were the "Puritans" known by that name?

A) They washed obsessively to purify themselves of sin.
B) They wanted to purify the Roman Catholic Church of its southern European tendencies.
C) They wished to purify the Church of England of all remnants of Roman Catholicism.
D) They sought to purify the English nation of its recent influx of Irish immigrants.
E) They viewed purification of sin as the paramount calling of all Christians.