English police officers are known as bobbies because:
A) the tails of the horses they rode were cut short (bobbed).
B) Sir Robert (Bobbie) Peel was responsible for their creation.
C) the first name Robert and its accompanying nickname Bobbie were extremely common among the first generation of English police.
D) they were paid in shillings, for which the slang term was "bob."
E) of the type of shirts they wore.