Which of the following statements is NOT true?（）
- AOliver Cromwell became Lord Protector of the Commonwealth of England in 1653 by the Petition of Right.
- BOliver Cromwell crushed without mercy a rebellion in Ireland.
- COliver Cromwell suppressed the Levellers,a group within his own army who advocated total religious and social equality.
- DOliver Cromwell replaced the Rump with an assembly largely chosen by himself.